Firebase mentions one of the keys in crash log as
Expected typeID 46 (CFRunLoopSource) does not match actual typeID 61 (CFSocket)
Here is the complete crash log
Crashed: com.apple.main-thread
EXC_BREAKPOINT 0x00000001901fe700
Crashed: com.apple.main-thread
0	CoreFoundation								 0x1901fe700 _CFAssertMismatchedTypeID + 112
1	CoreFoundation								 0x190107f0c __CFRunLoopSourceRemoveFromRunLoop + 306
2	CFNetwork											0x1907d0808 CFNetServiceBrowserStopSearch + 472
3	CoreFoundation								 0x19010b81c CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28
4	CoreFoundation								 0x19010b718 __CFRunLoopDoSource0 + 208
5	CoreFoundation								 0x19010aa28 __CFRunLoopDoSources0 + 268
6	CoreFoundation								 0x190104d20 __CFRunLoopRun + 824
7	CoreFoundation								 0x1901044bc CFRunLoopRunSpecific + 600
8	GraphicsServices							 0x1a6b89820 GSEventRunModal + 164
9	UIKitCore											0x192aa8734 -[UIApplication _run] + 1072
10 UIKitCore											0x192aade10 UIApplicationMain + 168
11 AppTarget_Qa				 				0x104e73ed4 main + 41 (AppDelegate.swift:41)
12 libdyld.dylib									0x18fdcbe60 start + 4
Thread 1
0	libsystem_kernel.dylib				 0x1bc0b85bc __workq_kernreturn + 8
1	libsystem_pthread.dylib				0x1d76e0954 _pthread_wqthread + 352
2	libsystem_pthread.dylib				0x1d76e777c start_wqthread + 8
com.apple.uikit.eventfetch-thread
0	libsystem_kernel.dylib				 0x1bc093dd0 mach_msg_trap + 8
1	libsystem_kernel.dylib				 0x1bc093184 mach_msg + 76
2	CoreFoundation								 0x19010acf8 __CFRunLoopServiceMachPort + 380
3	CoreFoundation								 0x190104ea8 __CFRunLoopRun + 1216
4	CoreFoundation								 0x1901044bc CFRunLoopRunSpecific + 600
5	Foundation										 0x191381e30 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 232
6	Foundation										 0x191381d08 -[NSRunLoop(NSRunLoop) runUntilDate:] + 92
7	UIKitCore											0x192b58e94 -[UIEventFetcher threadMain] + 516
8	Foundation										 0x1914ec0f0 NSThreadstart__ + 864
9	libsystem_pthread.dylib				0x1d76deca8 _pthread_start + 320
10 libsystem_pthread.dylib				0x1d76e7788 thread_start + 8
AVAudioSession Notify Thread
0	libsystem_kernel.dylib				 0x1bc093dd0 mach_msg_trap + 8
1	libsystem_kernel.dylib				 0x1bc093184 mach_msg + 76
2	CoreFoundation								 0x19010acf8 __CFRunLoopServiceMachPort + 380
3	CoreFoundation								 0x190104ea8 __CFRunLoopRun + 1216
4	CoreFoundation								 0x1901044bc CFRunLoopRunSpecific + 600
5	AudioSession									 0x1979a62ac GenericRunLoopThread::Entry(void*) + 164
6	AudioSession									 0x1979a8390 CAPThread::Entry(CAPThread*) + 92
7	libsystem_pthread.dylib				0x1d76deca8 _pthread_start + 320
8	libsystem_pthread.dylib				0x1d76e7788 thread_start + 8
com.google.firebase.crashlytics.MachExceptionServer
0	AppTarget_Qa				 				0x10510a9b4 FIRCLSProcessRecordAllThreads + 392 (FIRCLSProcess.c:392)
1	AppTarget_Qa 								0x10510ad98 FIRCLSProcessRecordAllThreads + 423 (FIRCLSProcess.c:423)
2	AppTarget_Qa 								0x105101624 FIRCLSHandler + 34 (FIRCLSHandler.m:34)
3	AppTarget_Qa 								0x105104054 FIRCLSMachExceptionServer + 524 (FIRCLSMachException.c:524)
4	libsystem_pthread.dylib				0x1d76deca8 _pthread_start + 320
5	libsystem_pthread.dylib				0x1d76e7788 thread_start + 8
Thread 2
0	libsystem_kernel.dylib				 0x1bc0b85bc __workq_kernreturn + 8
1	libsystem_pthread.dylib				0x1d76e0954 _pthread_wqthread + 352
2	libsystem_pthread.dylib				0x1d76e777c start_wqthread + 8
com.apple.NSURLConnectionLoader
0	libsystem_kernel.dylib				 0x1bc093dd0 mach_msg_trap + 8
1	libsystem_kernel.dylib				 0x1bc093184 mach_msg + 76
2	CoreFoundation								 0x19010acf8 __CFRunLoopServiceMachPort + 380
3	CoreFoundation								 0x190104ea8 __CFRunLoopRun + 1216
4	CoreFoundation								 0x1901044bc CFRunLoopRunSpecific + 600
5	CFNetwork											0x1909bd050 _CFURLStorageSessionCopyCache + 63240
6	Foundation										 0x1914ec0f0 NSThreadstart__ + 864
7	libsystem_pthread.dylib				0x1d76deca8 _pthread_start + 320
8	libsystem_pthread.dylib				0x1d76e7788 thread_start + 8
com.apple.CFSocket.private
0	libsystem_kernel.dylib				 0x1bc0b7c40 __select + 8
1	libsystem_kernel.dylib				 0x1bc0b7c40 select$DARWIN_EXTSN + 8
2	CoreFoundation								 0x190117688 __CFSocketManager + 636
3	libsystem_pthread.dylib				0x1d76deca8 _pthread_start + 320
4	libsystem_pthread.dylib				0x1d76e7788 thread_start + 8
Thread 3
0	libsystem_kernel.dylib				 0x1bc0b85bc __workq_kernreturn + 8
1	libsystem_pthread.dylib				0x1d76e0954 _pthread_wqthread + 352
2	libsystem_pthread.dylib				0x1d76e777c start_wqthread + 8
Thread 4
0	libsystem_kernel.dylib				 0x1bc0b85bc __workq_kernreturn + 8
1	libsystem_pthread.dylib				0x1d76e0954 _pthread_wqthread + 352
2	libsystem_pthread.dylib				0x1d76e777c start_wqthread + 8
Thread 5
0	libsystem_kernel.dylib				 0x1bc0b85bc __workq_kernreturn + 8
1	libsystem_pthread.dylib				0x1d76e0954 _pthread_wqthread + 352
2	libsystem_pthread.dylib				0x1d76e777c start_wqthread + 8
arpit.mishra_wdc
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I could see in firebase keys section it has "Expected typeID 46 (CFRunLoopSource) does not match actual typeID 61 (CFSocket)" for key "crashinfoentry_0"