I'm getting numerous crashes and unable to pinpoint/resolve this issue.I'm attaching the crash log below.Any insight is appreciated.# Crashlytics - plaintext stacktrace downloaded by Hoang Tran at Fri, 29 Dec 2017 17:37:30 GMT# URL: https://fabric.io/youmail-inc/ios/apps/rh8qq5uxc8.youmail./issues/5941995fbe077a4dcc21b0db?time=last-seven-days/sessions/5f6179c4ca12460cb5b33a983d9ac52b_fbbc23bfecbb11e7a2ec56847afe9799_0_v2# Organization: YouMail - iOS# Platform: ios# Application: YouMail# Version: 4.4.3.4# Bundle Identifier: RH8QQ5UXC8.youmail.# Issue #: 6275# Issue ID: 5941995fbe077a4dcc21b0db# Session ID: 5f6179c4ca12460cb5b33a983d9ac52b_fbbc23bfecbb11e7a2ec56847afe9799_0_v2# Date: 2017-12-29T17:16:00Z# OS Version: 11.2.1 (15C153)# Device: iPhone 7 Plus# RAM Free: 9.9%# Disk Free: 88.8%#6. Crashed: com.apple.NSURLConnectionLoader0 libsystem_kernel.dylib 0x180c842e8 __pthread_kill + 81 libsystem_pthread.dylib 0x180d992f8 pthread_kill$VARIANT$mp + 3962 libsystem_c.dylib 0x180bf2fbc abort + 1403 libsystem_c.dylib 0x180bc6aa0 basename_r + 3144 CFNetwork 0x18190fbf8 ___ZN15HTTPTransaction17RequestBodyStream22bodyStartProvidingDataEU13block_pointerFvP15dispatch_data_s13CFStreamErrorbE_block_invoke_2 + 2305 libdispatch.dylib 0x180aeea14 _dispatch_client_callout + 166 libdispatch.dylib 0x180af6200 _dispatch_block_invoke_direct$VARIANT$mp + 2887 CFNetwork 0x181928618 RunloopBlockContext::_invoke_block(void const*, void*) + 368 CoreFoundation 0x1810377a0 CFArrayApplyFunction + 809 CFNetwork 0x1819284dc RunloopBlockContext::perform() + 12810 CFNetwork 0x181929694 MultiplexerSource::perform() + 31211 CFNetwork 0x1819293f4 MultiplexerSource::_perform(void*) + 6012 CoreFoundation 0x18111a97c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 2413 CoreFoundation 0x18111a8fc __CFRunLoopDoSource0 + 8814 CoreFoundation 0x18111a184 __CFRunLoopDoSources0 + 20415 CoreFoundation 0x181117d5c __CFRunLoopRun + 104816 CoreFoundation 0x181037e58 CFRunLoopRunSpecific + 43617 CFNetwork 0x181927128 -[__CoreSchedulingSetRunnable runForever] + 78018 Foundation 0x181b6f0f4 __NSThread__start__ + 99619 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 30820 libsystem_pthread.dylib 0x180d98180 _pthread_body + 31021 libsystem_pthread.dylib 0x180d96b74 thread_start + 4--#0. com.apple.main-thread0 libsystem_kernel.dylib 0x180c63568 mach_msg_trap + 81 libsystem_kernel.dylib 0x180c633e0 mach_msg + 722 CoreFoundation 0x18111a308 __CFRunLoopServiceMachPort + 1963 CoreFoundation 0x181117ed4 __CFRunLoopRun + 14244 CoreFoundation 0x181037e58 CFRunLoopRunSpecific + 4365 GraphicsServices 0x182ee4f84 GSEventRunModal + 1006 UIKit 0x18a6b767c UIApplicationMain + 2367 YouMail 0x1052f5068 main (AppDelegate.swift:33)8 libdyld.dylib 0x180b5456c start + 4#1. Thread0 libsystem_kernel.dylib 0x180c840f0 __psynch_cvwait + 81 libsystem_pthread.dylib 0x180d9ace4 _pthread_cond_wait$VARIANT$mp + 6402 libc++.1.dylib 0x18033bea4 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 243 JavaScriptCore 0x188478b58 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::unique_lock<bmalloc::Mutex>&) + 964 JavaScriptCore 0x188478a80 bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>::threadRunLoop() + 1725 JavaScriptCore 0x188478de4 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>*), bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>*> >(void*) + 446 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 3087 libsystem_pthread.dylib 0x180d98180 _pthread_body + 3108 libsystem_pthread.dylib 0x180d96b74 thread_start + 4#2. WebThread0 libsystem_kernel.dylib 0x180c63568 mach_msg_trap + 81 libsystem_kernel.dylib 0x180c633e0 mach_msg + 722 CoreFoundation 0x18111a308 __CFRunLoopServiceMachPort + 1963 CoreFoundation 0x181117ed4 __CFRunLoopRun + 14244 CoreFoundation 0x181037e58 CFRunLoopRunSpecific + 4365 WebCore 0x188f452c8 RunWebThread(void*) + 5606 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 3087 libsystem_pthread.dylib 0x180d98180 _pthread_body + 3108 libsystem_pthread.dylib 0x180d96b74 thread_start + 4#3. com.apple.uikit.eventfetch-thread0 libsystem_kernel.dylib 0x180c63568 mach_msg_trap + 81 libsystem_kernel.dylib 0x180c633e0 mach_msg + 722 CoreFoundation 0x18111a308 __CFRunLoopServiceMachPort + 1963 CoreFoundation 0x181117ed4 __CFRunLoopRun + 14244 CoreFoundation 0x181037e58 CFRunLoopRunSpecific + 4365 Foundation 0x181a6d594 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 3046 Foundation 0x181a8c9ac -[NSRunLoop(NSRunLoop) runUntilDate:] + 967 UIKit 0x18b2217b8 -[UIEventFetcher threadMain] + 1368 Foundation 0x181b6f0f4 __NSThread__start__ + 9969 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 30810 libsystem_pthread.dylib 0x180d98180 _pthread_body + 31011 libsystem_pthread.dylib 0x180d96b74 thread_start + 4#4. com.twitter.crashlytics.ios.MachExceptionServer0 libsystem_kernel.dylib 0x180c63568 mach_msg_trap + 81 libsystem_kernel.dylib 0x180c633e0 mach_msg + 722 YouMail 0x1054e6488 CLSMachExceptionServer + 43718012243 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 3084 libsystem_pthread.dylib 0x180d98180 _pthread_body + 3105 libsystem_pthread.dylib 0x180d96b74 thread_start + 4#5. AVAudioSession Notify Thread0 libsystem_kernel.dylib 0x180c63568 mach_msg_trap + 81 libsystem_kernel.dylib 0x180c633e0 mach_msg + 722 CoreFoundation 0x18111a308 __CFRunLoopServiceMachPort + 1963 CoreFoundation 0x181117ed4 __CFRunLoopRun + 14244 CoreFoundation 0x181037e58 CFRunLoopRunSpecific + 4365 AVFAudio 0x18699ddc4 GenericRunLoopThread::Entry(void*) + 1646 AVFAudio 0x1869c8830 CAPThread::Entry(CAPThread*) + 847 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 3088 libsystem_pthread.dylib 0x180d98180 _pthread_body + 3109 libsystem_pthread.dylib 0x180d96b74 thread_start + 4#6. Crashed: com.apple.NSURLConnectionLoader0 libsystem_kernel.dylib 0x180c842e8 __pthread_kill + 81 libsystem_pthread.dylib 0x180d992f8 pthread_kill$VARIANT$mp + 3962 libsystem_c.dylib 0x180bf2fbc abort + 1403 libsystem_c.dylib 0x180bc6aa0 basename_r + 3144 CFNetwork 0x18190fbf8 ___ZN15HTTPTransaction17RequestBodyStream22bodyStartProvidingDataEU13block_pointerFvP15dispatch_data_s13CFStreamErrorbE_block_invoke_2 + 2305 libdispatch.dylib 0x180aeea14 _dispatch_client_callout + 166 libdispatch.dylib 0x180af6200 _dispatch_block_invoke_direct$VARIANT$mp + 2887 CFNetwork 0x181928618 RunloopBlockContext::_invoke_block(void const*, void*) + 368 CoreFoundation 0x1810377a0 CFArrayApplyFunction + 809 CFNetwork 0x1819284dc RunloopBlockContext::perform() + 12810 CFNetwork 0x181929694 MultiplexerSource::perform() + 31211 CFNetwork 0x1819293f4 MultiplexerSource::_perform(void*) + 6012 CoreFoundation 0x18111a97c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 2413 CoreFoundation 0x18111a8fc __CFRunLoopDoSource0 + 8814 CoreFoundation 0x18111a184 __CFRunLoopDoSources0 + 20415 CoreFoundation 0x181117d5c __CFRunLoopRun + 104816 CoreFoundation 0x181037e58 CFRunLoopRunSpecific + 43617 CFNetwork 0x181927128 -[__CoreSchedulingSetRunnable runForever] + 78018 Foundation 0x181b6f0f4 __NSThread__start__ + 99619 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 30820 libsystem_pthread.dylib 0x180d98180 _pthread_body + 31021 libsystem_pthread.dylib 0x180d96b74 thread_start + 4#7. com.apple.CoreMotion.MotionThread0 libsystem_kernel.dylib 0x180c63568 mach_msg_trap + 81 libsystem_kernel.dylib 0x180c633e0 mach_msg + 722 CoreFoundation 0x18111a308 __CFRunLoopServiceMachPort + 1963 CoreFoundation 0x181117ed4 __CFRunLoopRun + 14244 CoreFoundation 0x181037e58 CFRunLoopRunSpecific + 4365 CoreFoundation 0x181086f54 CFRunLoopRun + 1166 CoreMotion 0x1864a50e8 (null) + 2272647 libsystem_pthread.dylib 0x180d982b4 _pthread_body + 3088 libsystem_pthread.dylib 0x180d98180 _pthread_body + 3109 libsystem_pthread.dylib 0x180d96b74 thread_start + 4#8. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#9. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d97080 _pthread_wqthread + 12882 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#10. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#11. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#12. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#13. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#14. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#15. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d97080 _pthread_wqthread + 12882 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#16. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4#17. Thread0 libsystem_kernel.dylib 0x180c84d80 __workq_kernreturn + 81 libsystem_pthread.dylib 0x180d96eec _pthread_wqthread + 8842 libsystem_pthread.dylib 0x180d96b6c start_wqthread + 4