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For the last two weeks we have made several releases of our app due to higly increased crash rates of our app. Unfortunattely we can't reproduce the issues and we are struggleing to understand the crash reports.Our two new crashes started to appear when we migrated from xcode 10.1 to xcode 10.3. We then downgraded to 10.1 and the issue dissapeared. A couple of days later we hade to migrate to xcode 11 to fix some urgent ios 13 issues and the crashes reappeared.From the looks ot the crashlogs (collected by Fabric/Crashlytics) it has something to do with Dictionary and String subscript getter. As you can see in the crashreports the functions are compiler-generated so the line 0 isn't really helpful. We also made a last effort to disable all compiler optimizations to get a clearer picture of the issue, now Apple claims that the app doesn't even start (but it works for our entire team, our testdevices, relatives with iphones etc.)The issue seems to be present at all iOS devices at all versions of the OS.Anything that can point us in the right direction would me much appreciated.Issue 1, String,Sure we handle strings here, but we tried all sorts of data here. empty string, long strings, shorts string, matching string and non matching string (regex).# Crashlytics - plaintext stacktrace downloaded by Erik at Sat, 28 Sep 2019 12:28:28 GMT # Organization: XYZ AB # Platform: ios # Application: XYZ # Version: 11.19.3 (1499) # Bundle Identifier: com.XYZ.XYZ # Issue ID: 960e422607dcb9f570452c13f1db287b # Session ID: 366cbe7f6c8942b5a39d6e53a5befaa6_DNE_0_v2 # Date: 2019-09-28T12:14:00Z # OS Version: 12.2.0 (16E227) # Device: iPhone 7 # RAM Free: 3.9% # Disk Free: 14.2% #0. Crashed: com.twitter.crashlytics.ios.exception 0 XYZ 0x102ee6d78 CLSProcessRecordAllThreads + 4315524472 1 XYZ 0x102ee7160 CLSProcessRecordAllThreads + 4315525472 2 XYZ 0x102ed69e8 CLSHandler + 4315458024 3 XYZ 0x102ee537c __CLSExceptionRecord_block_invoke + 4315517820 4 libdispatch.dylib 0x1a03397d4 + 16 + 16 5 libdispatch.dylib 0x1a02e7c18 _dispatch_lane_barrier_sync_invoke_and_complete + 56 6 XYZ 0x102ee4de8 CLSExceptionRecord + 4315516392 7 XYZ 0x102ee4c14 CLSExceptionRecordNSException + 4315515924 8 XYZ 0x102ee4808 CLSTerminateHandler() + 4315514888 9 libc++abi.dylib 0x19fac8838 std::__terminate(void (*)()) + 16 10 libc++abi.dylib 0x19fac88c4 std::terminate() + 84 11 libobjc.A.dylib 0x19fad3d5c _destroyAltHandlerList + 10 12 libdispatch.dylib 0x1a03397e8 _dispatch_client_callout + 36 13 libdispatch.dylib 0x1a02e7004 + 1068 + 1068 14 CoreFoundation 0x1a0889ec0 + 12 + 12 15 CoreFoundation 0x1a0884df8 + 1924 + 1924 16 CoreFoundation 0x1a0884354 CFRunLoopRunSpecific + 436 + 436 17 GraphicsServices 0x1a2a8479c GSEventRunModal + 104 + 104 18 UIKitCore 0x1cce3bb68 UIApplicationMain + 212 + 212 19 XYZ 0x102966e1c main + 31 (main.m:31) 20 libdyld.dylib 0x1a034a8e0 + 4 + 4 -- Fatal Exception: NSRangeException 0 CoreFoundation 0x1a08f8518 __exceptionPreprocess 1 libobjc.A.dylib 0x19fad39f8 objc_exception_throw 2 CoreFoundation 0x1a0802c70 -[NSCache init] 3 Foundation 0x1a1257174 -[NSPathStore2 characterAtIndex:] 4 libswiftCore.dylib 0x1ce54c1a4 specialized _StringGuts.foreignErrorCorrectedUTF16CodeUnit(at:) 5 libswiftCore.dylib 0x1ce54c248 specialized _StringGuts.foreignScalarAlign(_:) 6 XYZ 0x10298a42c specialized String.subscript.getter () 7 XYZ 0x102aafd08 specialized AppLinkComponents.adIdentifierFromUniversalLinkUrl(_:) () 8 XYZ 0x102aaced4 AppLinkComponents.adIdentifierFromUrl(_:) () 9 XYZ 0x102aac99c AppLinkComponents.init(URL:) + 106 (AppLinkComponents.swift:106) 10 XYZ 0x102c1238c specialized static HandoffController.continueUserActivity(_:in:appDelegate:) (AppLinkComponents.swift) 11 XYZ 0x102aa586c @objc AppDelegate.application(_:continue:restorationHandler:) () 12 GoogleUtilities 0x103f2af10 (Missing) 13 UIKitCore 0x1cce37860 -[UIApplication activityContinuationManager:continueUserActivity:] 14 UIKitCore 0x1cd182e84 -[UIActivityContinuationManager _continueUserActivity:] 15 UIKitCore 0x1cd183b9c __72-[UIActivityContinuationManager handleActivityContinuation:isSuspended:]_block_invoke_3 16 UIKitCore 0x1cc8c607c -[_UIApplicationModalProgressController _callAndClearDismissalHandlerWasDismissedByUser:] 17 UIKitCore 0x1cc8c6454 -[_UIApplicationModalProgressController hideAfterMinimumUptimeWithDismissalHandler:] 18 UIKitCore 0x1cce37504 -[UIApplication activityContinuationManager:hideProgressUIWithCompletion:] 19 UIKitCore 0x1cd182e1c -[UIActivityContinuationManager _endCurrentActivityContinuationWithCompletion:] 20 UIKitCore 0x1cd1838f0 __72-[UIActivityContinuationManager handleActivityContinuation:isSuspended:]_block_invoke_2 21 libdispatch.dylib 0x1a0338a38 + 24 22 libdispatch.dylib 0x1a03397d4 + 16 23 libdispatch.dylib 0x1a02e7004 + 1068 24 CoreFoundation 0x1a0889ec0 + 12 25 CoreFoundation 0x1a0884df8 + 1924 26 CoreFoundation 0x1a0884354 CFRunLoopRunSpecific + 436 27 GraphicsServices 0x1a2a8479c GSEventRunModal + 104 28 UIKitCore 0x1cce3bb68 UIApplicationMain + 212 29 XYZ 0x102966e1c main + 31 (main.m:31) 30 libdyld.dylib 0x1a034a8e0 + 4 #0. Crashed: com.twitter.crashlytics.ios.exception 0 XYZ 0x102ee6d78 CLSProcessRecordAllThreads + 4315524472 1 XYZ 0x102ee7160 CLSProcessRecordAllThreads + 4315525472 2 XYZ 0x102ed69e8 CLSHandler + 4315458024 3 XYZ 0x102ee537c __CLSExceptionRecord_block_invoke + 4315517820 4 libdispatch.dylib 0x1a03397d4 + 16 + 16 5 libdispatch.dylib 0x1a02e7c18 _dispatch_lane_barrier_sync_invoke_and_complete + 56 6 XYZ 0x102ee4de8 CLSExceptionRecord + 4315516392 7 XYZ 0x102ee4c14 CLSExceptionRecordNSException + 4315515924 8 XYZ 0x102ee4808 CLSTerminateHandler() + 4315514888 9 libc++abi.dylib 0x19fac8838 std::__terminate(void (*)()) + 16 10 libc++abi.dylib 0x19fac88c4 std::terminate() + 84 11 libobjc.A.dylib 0x19fad3d5c _destroyAltHandlerList + 10 12 libdispatch.dylib 0x1a03397e8 _dispatch_client_callout + 36 13 libdispatch.dylib 0x1a02e7004 + 1068 + 1068 14 CoreFoundation 0x1a0889ec0 + 12 + 12 15 CoreFoundation 0x1a0884df8 + 1924 + 1924 16 CoreFoundation 0x1a0884354 CFRunLoopRunSpecific + 436 + 436 17 GraphicsServices 0x1a2a8479c GSEventRunModal + 104 + 104 18 UIKitCore 0x1cce3bb68 UIApplicationMain + 212 + 212 19 XYZ 0x102966e1c main + 31 (main.m:31) 20 libdyld.dylib 0x1a034a8e0 + 4 + 4 #1. io.answers.EventQueue (QOS: BACKGROUND) 0 libsystem_kernel.dylib 0x1a0497a5c lstat + 8 1 Foundation 0x1a1325e28 _NSFileExistsAtPath + 192 2 Foundation 0x1a1259a84 -[NSFileManager fileExistsAtPath:] + 120 3 XYZ 0x102ef3880 -[ANSMetadata computeIsJailbroken] + 4315576448 4 XYZ 0x102ef35e8 -[ANSMetadata initWithFabric:betaToken:] + 4315575784 5 XYZ 0x102efcb8c __56-[ANSAnswersController initWithBetaToken:rootDirectory:]_block_invoke + 4315614092 6 Foundation 0x1a135cf68 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16 7 Foundation 0x1a1269420 -[NSBlockOperation main] + 72 8 Foundation 0x1a1268908 -[__NSOperationInternal _start:] + 740 9 Foundation 0x1a135ecec __NSOQSchedule_f + 272 10 libdispatch.dylib 0x1a02e77f0 _dispatch_block_async_invoke2 + 104 11 libdispatch.dylib 0x1a03397d4 + 16 + 16 12 libdispatch.dylib 0x1a02de018 _dispatch_continuation_pop$VARIANT$mp + 412 13 libdispatch.dylib 0x1a02dd6dc _dispatch_async_redirect_invoke + 600 14 libdispatch.dylib 0x1a02ea02c _dispatch_root_queue_drain + 372 15 libdispatch.dylib 0x1a02ea8d0 _dispatch_worker_thread2 + 128 16 libsystem_pthread.dylib 0x1a05191b4 _pthread_wqthread + 464 17 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #2. com.google.GoogleConfigService.database 0 libsystem_kernel.dylib 0x1a0497408 fsync + 8 1 libsqlite3.dylib 0x1a0d5b5d4 sqlite3_free_table + 67964 2 libsqlite3.dylib 0x1a0d66014 sqlite3_randomness + 2284 3 libsqlite3.dylib 0x1a0d5aee0 sqlite3_free_table + 66184 4 libsqlite3.dylib 0x1a0d4533c sqlite3_value_text + 23708 5 libsqlite3.dylib 0x1a0d11000 sqlite3_finalize + 3636 6 libsqlite3.dylib 0x1a0d3dce8 sqlite3_step + 65920 7 libsqlite3.dylib 0x1a0d2dd24 sqlite3_step + 444 8 XYZ 0x102fb78c8 -[RCNConfigDBManager insertMainTableWithValues:fromSource:] + 4316379336 9 XYZ 0x102fb7604 __77-[RCNConfigDBManager insertMainTableWithValues:fromSource:completionHandler:]_block_invoke + 4316378628 10 libdispatch.dylib 0x1a0338a38 + 24 + 24 11 libdispatch.dylib 0x1a03397d4 + 16 + 16 12 libdispatch.dylib 0x1a02e2320 _dispatch_lane_serial_drain$VARIANT$mp + 592 13 libdispatch.dylib 0x1a02e2e3c _dispatch_lane_invoke$VARIANT$mp + 428 14 libdispatch.dylib 0x1a02eb4a8 _dispatch_workloop_worker_thread + 596 15 libsystem_pthread.dylib 0x1a0519114 _pthread_wqthread + 304 16 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #3. Thread 0 libsystem_kernel.dylib 0x1a0496b74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x1a0519138 _pthread_wqthread + 340 2 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #4. com.apple.uikit.eventfetch-thread 0 libsystem_kernel.dylib 0x1a048b0f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1a048a5a0 mach_msg + 72 2 CoreFoundation 0x1a0889cb4 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x1a0884bc4 __CFRunLoopRun + 1360 4 CoreFoundation 0x1a0884354 CFRunLoopRunSpecific + 436 + 436 5 Foundation 0x1a1251fcc -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 300 6 Foundation 0x1a1251e5c -[NSRunLoop(NSRunLoop) runUntilDate:] + 96 7 UIKitCore 0x1ccf21540 -[UIEventFetcher threadMain] + 136 8 Foundation 0x1a137e6e4 __NSThread__start__ + 984 9 libsystem_pthread.dylib 0x1a05182c0 _pthread_body + 128 10 libsystem_pthread.dylib 0x1a0518220 _pthread_start + 44 11 libsystem_pthread.dylib 0x1a051bcdc thread_start + 4 #5. com.google.fira.worker 0 libsystem_kernel.dylib 0x1a0497ffc pread + 8 1 libsqlite3.dylib 0x1a0da4134 sqlite3_rekey + 4676 2 libsqlite3.dylib 0x1a0cf4b98 sqlite3_snprintf + 5864 3 libsqlite3.dylib 0x1a0d17440 sqlite3_log + 3348 4 libsqlite3.dylib 0x1a0dad618 sqlite3_rekey + 42792 5 libsqlite3.dylib 0x1a0dbe620 sqlite3_rekey + 112432 6 libsqlite3.dylib 0x1a0d36658 sqlite3_step + 35568 7 libsqlite3.dylib 0x1a0d2dd24 sqlite3_step + 444 8 XYZ 0x1030151d0 -[APMSqliteStore validateDatabaseWithError:] + 4316762576 9 XYZ 0x1030150e0 -[APMSqliteStore openAndValidateDatabase:] + 4316762336 10 XYZ 0x103010640 -[APMSqliteStore initWithDatabasePath:] + 4316743232 11 XYZ 0x102fe0684 -[APMDatabase initializeDatabaseResourcesWithContext:databasePath:] + 4316546692 12 XYZ 0x102fd594c -[APMDatabase initWithDatabaseName:persistedConfig:] + 4316502348 13 XYZ 0x102fe70c0 __47-[APMMeasurement startMeasurementOnWorkerQueue]_block_invoke + 4316573888 14 libdispatch.dylib 0x1a03397d4 + 16 + 16 15 libdispatch.dylib 0x1a02dceb4 _dispatch_once_callout + 28 16 XYZ 0x102fe6cac -[APMMeasurement startMeasurementOnWorkerQueue] + 4316572844 17 XYZ 0x102fe680c -[APMMeasurement setEnabledOnWorkerQueue:] + 4316571660 18 XYZ 0x103000454 __51-[APMScheduler scheduleOnWorkerQueueBlockID:block:]_block_invoke + 4316677204 19 libdispatch.dylib 0x1a0338a38 + 24 + 24 20 libdispatch.dylib 0x1a03397d4 + 16 + 16 21 libdispatch.dylib 0x1a02e2320 _dispatch_lane_serial_drain$VARIANT$mp + 592 22 libdispatch.dylib 0x1a02e2e3c _dispatch_lane_invoke$VARIANT$mp + 428 23 libdispatch.dylib 0x1a02eb4a8 _dispatch_workloop_worker_thread + 596 24 libsystem_pthread.dylib 0x1a0519114 _pthread_wqthread + 304 25 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #6. com.apple.root.background-qos 0 libsystem_kernel.dylib 0x1a048b148 semaphore_timedwait_trap + 8 1 libdispatch.dylib 0x1a02db880 _dispatch_sema4_timedwait$VARIANT$mp + 64 2 libdispatch.dylib 0x1a02dc1d8 _dispatch_semaphore_wait_slow + 72 3 XYZ 0x10300984c -[APMConditionalUserPropertyController conditionalUserPropertiesWithNamePrefix:filterByOrigin:] + 4316715084 4 CoreFoundation 0x1a08ffba0 __invoking___ + 144 5 CoreFoundation 0x1a07e1c90 -[NSInvocation invoke] + 292 6 XYZ 0x102f17acc -[ABTConditionalUserPropertyController experimentsWithOrigin:] + 4315724492 7 XYZ 0x102f1a384 -[FIRExperimentController updateExperimentsInBackgroundQueueWithServiceOrigin:events:policy:lastStartTime:payloads:] + 4315734916 8 XYZ 0x102f1a264 __99-[FIRExperimentController updateExperimentsWithServiceOrigin:events:policy:lastStartTime:payloads:]_block_invoke + 4315734628 9 libdispatch.dylib 0x1a0338a38 + 24 + 24 10 libdispatch.dylib 0x1a03397d4 + 16 + 16 11 libdispatch.dylib 0x1a02ea160 _dispatch_root_queue_drain + 680 12 libdispatch.dylib 0x1a02ea8d0 _dispatch_worker_thread2 + 128 13 libsystem_pthread.dylib 0x1a05191b4 _pthread_wqthread + 464 14 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #7. Thread 0 libsystem_pthread.dylib 0x1a051bcd0 start_wqthread + 190 #8. com.apple.CFNetwork.Connection 0 libsystem_kernel.dylib 0x1a0495f08 __psynch_mutexdrop + 8 1 libsystem_pthread.dylib 0x1a0511890 _pthread_mutex_firstfit_wake + 28 2 CoreFoundation 0x1a0885460 CFRunLoopWakeUp + 276 3 CFNetwork 0x1a10f2d64 MultiplexerSource::_wakeupRunLoop(__CFRunLoop*, __CFString const*, void*) + 56 4 CFNetwork 0x1a10f2688 MultiplexerSource::signal(CoreSchedulingSet const*, MultiplexerClient*) + 292 5 CFNetwork 0x1a10f2550 RunLoopMultiplexer::signal(CoreSchedulingSet const*, MultiplexerClient*) + 68 6 CFNetwork 0x1a10f1714 RunloopBlockContext::addBlockAndSignal(void () block_pointer) + 152 7 CFNetwork 0x1a10d8e80 HTTPTransaction::RequestBodyStream::cleanup() + 168 8 CFNetwork 0x1a10d564c HTTPTransaction::_onqueue_closeAndCleanup() + 44 9 CFNetwork 0x1a0fcd75c HTTPProtocol::destroyReadStream() + 1436 10 CFNetwork 0x1a0fcb534 HTTPProtocol::cleanupStreams() + 36 11 CFNetwork 0x1a0fd2bb8 HTTPProtocol::endEncountered() + 352 12 CFNetwork 0x1a0fd2304 HTTPProtocol::handleStreamEvent(__CFHTTPMessage*, dispatch_data_s*, CFStreamError const*) + 384 13 CFNetwork 0x1a10d4fa8 HTTPTransaction::_onqueue_invokeHandler() + 344 14 CFNetwork 0x1a106bc4c HTTPConnection::_onqueue_responseDataArrived(dispatch_data_s*, CFStreamError, bool) + 280 15 CFNetwork 0x1a10cc084 HTTPEngine::_readBodyFinish(dispatch_data_s*, CFStreamError, bool) + 184 16 CFNetwork 0x1a10cc840 HTTPEngine::_deliverBodyBytes(dispatch_data_s*, CFStreamError, bool) + 224 17 CFNetwork 0x1a10cc50c HTTPEngine::_getBodyIntelligently(void (dispatch_data_s*, CFStreamError, bool) block_pointer) + 860 18 CFNetwork 0x1a10ca180 HTTPEngine::_readBodyStartNextRead() + 80 19 CFNetwork 0x1a10cc8d0 HTTPEngine::_deliverBodyBytes(dispatch_data_s*, CFStreamError, bool) + 368 20 CFNetwork 0x1a10cd1a8 invocation function for block in HTTPEngine::_getBodyIntelligently(void (dispatch_data_s*, CFStreamError, bool) block_pointer) + 144 21 libdispatch.dylib 0x1a0338a38 + 24 + 24 22 libdispatch.dylib 0x1a03397d4 + 16 + 16 23 libdispatch.dylib 0x1a02e2320 _dispatch_lane_serial_drain$VARIANT$mp + 592 24 libdispatch.dylib 0x1a02e2e70 _dispatch_lane_invoke$VARIANT$mp + 480 25 libdispatch.dylib 0x1a02e4108 _dispatch_workloop_invoke$VARIANT$mp + 1960 26 libdispatch.dylib 0x1a02eb4a8 _dispatch_workloop_worker_thread + 596 27 libsystem_pthread.dylib 0x1a0519114 _pthread_wqthread + 304 28 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #9. com.twitter.crashlytics.ios.MachExceptionServer 0 libsystem_kernel.dylib 0x1a048b0f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1a048a5a0 mach_msg + 72 2 XYZ 0x102ed19b4 CLSMachExceptionServer + 4315437492 3 libsystem_pthread.dylib 0x1a05182c0 _pthread_body + 128 4 libsystem_pthread.dylib 0x1a0518220 _pthread_start + 44 5 libsystem_pthread.dylib 0x1a051bcdc thread_start + 4 #10. Thread 0 libsystem_kernel.dylib 0x1a0496b74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x1a0519138 _pthread_wqthread + 340 2 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #11. Thread 0 libsystem_kernel.dylib 0x1a0496b74 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x1a0519138 _pthread_wqthread + 340 2 libsystem_pthread.dylib 0x1a051bcd4 start_wqthread + 4 #12. Thread 0 libsystem_pthread.dylib 0x1a051bcd0 start_wqthread + 190 #13. com.apple.NSURLConnectionLoader 0 libsystem_kernel.dylib 0x1a04969d4 __ulock_wait + 8 1 libsystem_platform.dylib 0x1a0507840 _os_nospin_lock_lock_slow + 172 2 CFNetwork 0x1a10f2a50 MultiplexerSource::perform() + 52 3 CFNetwork 0x1a10f28d0 MultiplexerSource::_perform(void*) + 60 4 CoreFoundation 0x1a088a2bc + 24 + 24 5 CoreFoundation 0x1a088a23c + 88 + 88 6 CoreFoundation 0x1a0889b24 __CFRunLoopDoSources0 + 176 7 CoreFoundation 0x1a0884a60 + 1004 + 1004 8 CoreFoundation 0x1a0884354 CFRunLoopRunSpecific + 436 + 436 9 CFNetwork 0x1a0e9d74c -[__CoreSchedulingSetRunnable runForever] + 216 10 Foundation 0x1a137e6e4 __NSThread__start__ + 984 11 libsystem_pthread.dylib 0x1a05182c0 _pthread_body + 128 12 libsystem_pthread.dylib 0x1a0518220 _pthread_start + 44 13 libsystem_pthread.dylib 0x1a051bcdc thread_start + 4 #14. JavaScriptCore bmalloc scavenger 0 libsystem_kernel.dylib 0x1a0495ee4 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x1a0510cf8 _pthread_cond_wait$VARIANT$mp + 636 2 libc++.1.dylib 0x19fa6d128 std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long="" long,="" std::__1::ratio<1l,="" 1000000000l=""> > >) + 96 3 JavaScriptCore 0x1a7a5f75c std::__1::cv_status std::__1::condition_variable::wait_until<std::__1::chrono::steady_clock, std::__1::chrono::duration<long="" long,="" std::__1::ratio<1l,="" 1000000000l=""> > >(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long="" long,="" std::__1::ratio<1l,="" 1000000000l=""> > > const&) + 124 4 JavaScriptCore 0x1a7a5f60c std::__1::cv_status std::__1::condition_variable_any::wait_until<std::__1::unique_lock, std::__1::chrono::steady_clock, std::__1::chrono::duration > >(std::__1::unique_lock&, std::__1::chrono::time_point<std::__1::chrono::steady_clock, std::__1::chrono::duration<long="" long,="" std::__1::ratio<1l,="" 1000000000l=""> > > const&) + 116 5 JavaScriptCore 0x1a7a5e2a4 bmalloc::Scavenger::threadRunLoop() + 296 6 JavaScriptCore 0x1a7a5d9a4 bmalloc::Scavenger::Scavenger(std::__1::lock_guard&) + 10 7 JavaScriptCore 0x1a7a5f3e4 std::__1::__thread_specific_ptr<std::__1::__thread_struct>::set_pointer(std::__1::__thread_struct*) + 38 8 libsystem_pthread.dylib 0x1a05182c0 _pthread_body + 128 9 libsystem_pthread.dylib 0x1a0518220 _pthread_start + 44 10 libsystem_pthread.dylib 0x1a051bcdc thread_start + 4 #15. WebThread 0 libsystem_kernel.dylib 0x1a048b0f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x1a048a5a0 mach_msg + 72 2 CoreFoundation 0x1a0889cb4 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x1a0884bc4 __CFRunLoopRun + 1360 4 CoreFoundation 0x1a0884354 CFRunLoopRunSpecific + 436 + 436 5 WebCore 0x1a94de480 RunWebThread(void*) + 600 6 libsystem_pthread.dylib 0x1a05182c0 _pthread_body + 128 7 libsystem_pthread.dylib 0x1a0518220 _pthread_start + 44 8 libsystem_pthread.dylib 0x1a051bcdc thread_start + 4Issue 2, Dictionary, I can't even see that we are using a Dictionary in our function sizedImageUrls (for some reason I can't post the enitre log)# Crashlytics - plaintext stacktrace downloaded by Erik at Sat, 28 Sep 2019 12:28:30 GMT # Organization: XYZ AB # Platform: ios # Application: XYZ # Version: 11.19.4 (1509) # Bundle Identifier: com.XYZ.XYZ # Issue ID: a0439209b46a197bf51efc1b0774d65e # Session ID: 327ccd2fc29749e998158f98233676e1_DNE_0_v2 # Date: 2019-09-28T11:35:00Z # OS Version: 13.1.1 (17A854) # Device: iPhone 12,3 # RAM Free: 25.9% # Disk Free: 40.8% #0. Crashed: com.apple.main-thread 0 XYZ 0x104c948e8 specialized Dictionary.subscript.getter (<compiler-generated>) 1 XYZ 0x104c95b40 specialized ImageUrlProvider.sizedImageUrls(baseUrls:size:backend:completion:) (<compiler-generated>) 2 XYZ 0x104c942c4 ImageUrlProvider.handleLayoutChange(in:) (<compiler-generated>) 3 XYZ 0x104c94324 @objc ImageUrlProvider.handleLayoutChange(in:) (<compiler-generated>) 4 XYZ 0x10494548c -[BLCollectionViewCell layoutSubviews] + 86 (BLCollectionViewCell.m:86) 5 UIKitCore 0x1ba767abc -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2156 6 libobjc.A.dylib 0x1b5f3faf0 -[NSObject performSelector:withObject:] + 68 7 QuartzCore 0x1bcd060f4 -[CALayer layoutSublayers] + 292 8 QuartzCore 0x1bcd063fc CA::Layer::layout_if_needed(CA::Transaction*) + 484 9 UIKitCore 0x1ba75341c -[UIView(Hierarchy) layoutBelowIfNeeded] + 552 10 UIKitCore 0x1ba759f60 +[UIView(Animation) performWithoutAnimation:] + 104 11 UIKitCore 0x1b9b56538 -[UICollectionViewAnimation startWithAnimator:] + 168 12 UIKitCore 0x1b9b2020c __71-[UICollectionView _updateWithItems:tentativelyForReordering:animator:]_block_invoke_2.2004 + 932 13 UIKitCore 0x1ba75b6fc +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 576 14 UIKitCore 0x1ba75bcec +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 112 15 UIKitCore 0x1b9b1f760 -[UICollectionView _updateWithItems:tentativelyForReordering:animator:] + 5224 16 UIKitCore 0x1b9b1944c -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:animator:] + 12908 17 UIKitCore 0x1b9b15694 -[UICollectionView _updateSections:updateAction:] + 412 18 UIKitCore 0x1b9b15860 -[UICollectionView reloadSections:] + 68 19 XYZ 0x104922f2c -[BLAdsListViewController adwatchServiceDidUpdateAdwatches:] + 720 (BLAdsListViewController.m:720) 20 XYZ 0x104ace394 specialized AdwatchServiceBridge.adwatchService(_:didUpdate:) (<compiler-generated>) 21 XYZ 0x104ac30b0 closure #1 in closure #2 in AdwatchService.downloadAdwatches(closure:) (<compiler-generated>) 22 XYZ 0x104d44fb8 thunk for @escaping @callee_guaranteed () -> () (<compiler-generated>) 23 libdispatch.dylib 0x1b5ecfbb0 _dispatch_call_block_and_release + 32 24 libdispatch.dylib 0x1b5ed100c _dispatch_client_callout + 20 25 libdispatch.dylib 0x1b5edccd8 _dispatch_main_queue_callback_4CF + 968 26 CoreFoundation 0x1b61a4e20 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 27 CoreFoundation 0x1b619fb7c __CFRunLoopRun + 1980 28 CoreFoundation 0x1b619f098 CFRunLoopRunSpecific + 480 29 GraphicsServices 0x1c0309534 GSEventRunModal + 108 30 UIKitCore 0x1ba2bf7ac UIApplicationMain + 1940 31 XYZ 0x1049cfe2c main + 31 (main.m:31) 32 libdyld.dylib 0x1b601ef30 <redacted> + 4