App crashes when I restart the app

My app apparently works fine once installed by testflight.

The problem comes when I restart the app or close the task of the app on my iPhone, and I try to open the app again. In this moment, the app crashes and it doesn't open again.

The app appears with the red/orange circle next to the name/title.

My iPhone have the iOS version 13.1

This is my Crash Symbolicated log:

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  0

Thread 0 name:
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x0000000183079ec4 __pthread_kill + 8
1   libsystem_pthread.dylib         0x0000000182f95774 pthread_kill$VARIANT$mp + 112 (pthread.c:1456)
2   libsystem_c.dylib               0x0000000182ee9844 abort + 100 (abort.c:110)
3   Ambassador.iOS                  0x000000010440f138 xamarin_initialize.cold.1 + 0
4   Ambassador.iOS                  0x00000001044053ec xamarin_printf + 24908780 (runtime.m:2541)
5   Ambassador.iOS                  0x00000001042c6fe0 mono_invoke_unhandled_exception_hook + 132
6   Ambassador.iOS                  0x000000010425bb94 mono_handle_exception_internal + 5580
7   Ambassador.iOS                  0x000000010425a5bc mono_handle_exception + 56
8   Ambassador.iOS                  0x0000000104250134 mono_arm_throw_exception + 376
9   Ambassador.iOS                  0x000000010306782c throw_exception + 172
10  Ambassador.iOS                  0x0000000102e2936c System_Runtime_ExceptionServices_ExceptionDispatchInfo_Throw + 44
11  Ambassador.iOS                  0x0000000102e2f264 System_Runtime_CompilerServices_AsyncMethodBuilderCore__c__ThrowAsyncb__7_0_object + 84
12  Ambassador.iOS                  0x0000000103a082ec Foundation_NSAsyncSynchronizationContextDispatcher_Apply + 14435052 (NSAction.cs:178)
13  Ambassador.iOS                  0x0000000103029c44 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 260
14  Ambassador.iOS                  0x000000010426debc mono_jit_runtime_invoke + 1100
15  Ambassador.iOS                  0x000000010432a904 mono_runtime_invoke_checked + 148
16  Ambassador.iOS                  0x000000010432e1a0 mono_runtime_invoke + 156
17  Ambassador.iOS                  0x0000000102c951ac native_to_managed_trampoline_17(objc_object*, objc_selector*, _MonoMethod**, unsigned int) + 332204 (registrar.m:843)
18  Ambassador.iOS                  0x0000000102c963e8 -[__MonoMac_NSAsyncSynchronizationContextDispatcher xamarinApplySelector] + 336872 (registrar.m:10891)
19  Foundation                      0x000000018366a24c __NSThreadPerformPerform + 232 (NSThread.m:807)
20  CoreFoundation                  0x00000001831ff7c4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 (CFRunLoop.c:1922)
21  CoreFoundation                  0x00000001831ff71c __CFRunLoopDoSource0 + 80 (CFRunLoop.c:1956)
22  CoreFoundation                  0x00000001831feeb4 __CFRunLoopDoSources0 + 180 (CFRunLoop.c:1992)
23  CoreFoundation                  0x00000001831fa000 __CFRunLoopRun + 1080 (CFRunLoop.c:2882)
24  CoreFoundation                  0x00000001831f98a0 CFRunLoopRunSpecific + 464 (CFRunLoop.c:3192)
25  GraphicsServices                0x000000018d151328 GSEventRunModal + 104 (GSEvent.c:2246)
26  UIKitCore                       0x00000001872ea740 UIApplicationMain + 1936 (UIApplication.m:4758)
27  Ambassador.iOS                  0x0000000103a5cc90 wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 352
28  Ambassador.iOS                  0x00000001039c4c4c UIKit_UIApplication_Main_string___intptr_intptr + 14158924 (UIApplication.cs:86)
29  Ambassador.iOS                  0x00000001039c4bd4 UIKit_UIApplication_Main_string___string_string + 14158804 (UIApplication.cs:66)
30  Ambassador.iOS                  0x0000000102cc3274 Ambassador_iOS_Application_Main_string__ + 520820 (/<unknown>:1)
31  Ambassador.iOS                  0x0000000103029c44 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 260
32  Ambassador.iOS                  0x000000010426debc mono_jit_runtime_invoke + 1100
33  Ambassador.iOS                  0x000000010432a904 mono_runtime_invoke_checked + 148
34  Ambassador.iOS                  0x0000000104330bcc mono_runtime_exec_main_checked + 120
35  Ambassador.iOS                  0x000000010424c088 mono_jit_exec + 376
36  Ambassador.iOS                  0x000000010440c680 xamarin_main + 24938112 (monotouch-main.m:0)
37  Ambassador.iOS                  0x0000000102cc17b8 main + 513976 (main.m:158)
38  libdyld.dylib                   0x0000000183084360 start + 4

Thread 1 name:
Thread 1:
0   libsystem_pthread.dylib         0x0000000182fa1acc start_wqthread + 0

Thread 2:
0   libsystem_pthread.dylib         0x0000000182fa1acc start_wqthread + 0

Thread 3:
0   libsystem_pthread.dylib         0x0000000182fa1acc start_wqthread + 0

Thread 4 name:
Thread 4:
0   libsystem_pthread.dylib         0x0000000182fa1acc start_wqthread + 0

Thread 5 name:
Thread 5:
0   libsystem_pthread.dylib         0x0000000182fa1acc start_wqthread + 0

Thread 6 name:
Thread 6:
0   libsystem_kernel.dylib          0x0000000183079c94 __psynch_cvwait + 8
1   libsystem_pthread.dylib         0x0000000182f971e8 _pthread_cond_wait$VARIANT$mp + 684 (pthread_cond.c:591)
2   libc++.1.dylib                  0x00000001830cb7a8 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 24 (__threading_support:287)
3   JavaScriptCore                  0x0000000191fafeec void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::uni... + 108 (condition_variable:204)
4   JavaScriptCore                  0x0000000191fb38bc bmalloc::Scavenger::threadRunLoop() + 200 (condition_variable:213)
5   JavaScriptCore                  0x0000000191fb35a4 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 12 (Scavenger.cpp:384)
6   JavaScriptCore                  0x0000000191fb48b0 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, st... + 40 (type_traits:4361)
7   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
8   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 7 name:
Thread 7:
0   libsystem_kernel.dylib          0x0000000183058634 mach_msg_trap + 8
1   libsystem_kernel.dylib          0x0000000183057aa0 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                  0x00000001831ff04c __CFRunLoopServiceMachPort + 216 (CFRunLoop.c:2575)
3   CoreFoundation                  0x00000001831fa16c __CFRunLoopRun + 1444 (CFRunLoop.c:2931)
4   CoreFoundation                  0x00000001831f98a0 CFRunLoopRunSpecific + 464 (CFRunLoop.c:3192)
5   WebCore                         0x000000018b193b60 RunWebThread(void*) + 612 (WebCoreThread.mm:626)
6   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
7   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 8 name:
Thread 8:
0   libsystem_kernel.dylib          0x0000000183079c94 __psynch_cvwait + 8
1   libsystem_pthread.dylib         0x0000000182f971e8 _pthread_cond_wait$VARIANT$mp + 684 (pthread_cond.c:591)
2   Ambassador.iOS                  0x00000001043d17e0 thread_func + 468
3   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
4   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 9 name:
Thread 9:
0   libsystem_kernel.dylib          0x0000000183058670 semaphore_wait_trap + 8
1   Ambassador.iOS                  0x00000001042ca25c finalizer_thread + 372
2   Ambassador.iOS                  0x00000001043795cc start_wrapper_internal + 344
3   Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
4   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
5   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 10 name:
Thread 10:
0   libsystem_kernel.dylib          0x0000000183058634 mach_msg_trap + 8
1   libsystem_kernel.dylib          0x0000000183057aa0 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                  0x00000001831ff04c __CFRunLoopServiceMachPort + 216 (CFRunLoop.c:2575)
3   CoreFoundation                  0x00000001831fa16c __CFRunLoopRun + 1444 (CFRunLoop.c:2931)
4   CoreFoundation                  0x00000001831f98a0 CFRunLoopRunSpecific + 464 (CFRunLoop.c:3192)
5   Foundation                      0x0000000183539824 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 228 (NSRunLoop.m:374)
6   Foundation                      0x0000000183539704 -[NSRunLoop(NSRunLoop) runUntilDate:] + 88 (NSRunLoop.m:421)
7   UIKitCore                       0x0000000187383158 -[UIEventFetcher threadMain] + 152 (UIEventFetcher.m:637)
8   Foundation                      0x000000018366a0c4 __NSThread__start__ + 848 (NSThread.m:724)
9   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
10  libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 11 name:
Thread 11:
0   libsystem_kernel.dylib          0x0000000183079c94 __psynch_cvwait + 8
1   libsystem_pthread.dylib         0x0000000182f971e8 _pthread_cond_wait$VARIANT$mp + 684 (pthread_cond.c:591)
2   Ambassador.iOS                  0x00000001043e16e8 mono_os_cond_timedwait + 168
3   Ambassador.iOS                  0x00000001043e9cd0 mono_thread_info_sleep + 568
4   Ambassador.iOS                  0x000000010436d7ac monitor_thread + 908
5   Ambassador.iOS                  0x00000001043795cc start_wrapper_internal + 344
6   Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
7   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
8   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 12 name:
Thread 12:
0   libsystem_kernel.dylib          0x0000000183058688 semaphore_timedwait_trap + 8
1   Ambassador.iOS                  0x000000010436dd6c worker_thread + 848
2   Ambassador.iOS                  0x00000001043795cc start_wrapper_internal + 344
3   Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
4   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
5   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 13 name:
Thread 13:
0   libsystem_kernel.dylib          0x0000000183058688 semaphore_timedwait_trap + 8
1   Ambassador.iOS                  0x000000010436dd6c worker_thread + 848
2   Ambassador.iOS                  0x00000001043795cc start_wrapper_internal + 344
3   Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
4   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
5   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 14 name:
Thread 14:
0   libsystem_kernel.dylib          0x0000000183079c94 __psynch_cvwait + 8
1   libsystem_pthread.dylib         0x0000000182f971e8 _pthread_cond_wait$VARIANT$mp + 684 (pthread_cond.c:591)
2   Ambassador.iOS                  0x00000001043e16e8 mono_os_cond_timedwait + 168
3   Ambassador.iOS                  0x0000000104384cc4 mono_w32handle_timedwait_signal_handle + 204
4   Ambassador.iOS                  0x0000000104384b9c mono_w32handle_wait_one + 756
5   Ambassador.iOS                  0x0000000104384dd4 mono_w32handle_wait_multiple + 132
6   Ambassador.iOS                  0x0000000104373d08 ves_icall_System_Threading_WaitHandle_Wait_internal + 152
7   Ambassador.iOS                  0x00000001042ed50c ves_icall_System_Threading_WaitHandle_Wait_internal_raw + 104
8   Ambassador.iOS                  0x0000000102dc145c wrapper_managed_to_native_System_Threading_WaitHandle_Wait_internal_intptr__int_bool_int + 140
9   Ambassador.iOS                  0x0000000102dc0fb4 System_Threading_WaitHandle_WaitOneNative_System_Runtime_InteropServices_SafeHandle_uint_bool_bool + 260
10  Ambassador.iOS                  0x0000000102dc0abc System_Threading_WaitHandle_InternalWaitOne_System_Runtime_InteropServices_SafeHandle_long_bool_bool + 60
11  Ambassador.iOS                  0x0000000102dc0a6c System_Threading_WaitHandle_WaitOne_long_bool + 60
12  Ambassador.iOS                  0x0000000102dc096c System_Threading_WaitHandle_WaitOne_int_bool + 60
13  Ambassador.iOS                  0x0000000102dc0a18 System_Threading_WaitHandle_WaitOne_int + 40
14  Ambassador.iOS                  0x0000000102dc3be4 System_Threading_Timer_Scheduler_SchedulerThread + 212
15  Ambassador.iOS                  0x0000000102dba94c System_Threading_ThreadHelper_ThreadStart_Context_object + 188
16  Ambassador.iOS                  0x0000000102db8770 System_Threading_ExecutionContext_RunInternal_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 416
17  Ambassador.iOS                  0x0000000102db857c System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 44
18  Ambassador.iOS                  0x0000000102db8500 System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 80
19  Ambassador.iOS                  0x0000000102dbaab4 System_Threading_ThreadHelper_ThreadStart + 52
20  Ambassador.iOS                  0x0000000103029c44 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 260
21  Ambassador.iOS                  0x000000010426debc mono_jit_runtime_invoke + 1100
22  Ambassador.iOS                  0x000000010432a904 mono_runtime_invoke_checked + 148
23  Ambassador.iOS                  0x00000001043302a8 mono_runtime_delegate_try_invoke + 168
24  Ambassador.iOS                  0x000000010437968c start_wrapper_internal + 536
25  Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
26  libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
27  libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 15 name:
Thread 15:
0   libsystem_kernel.dylib          0x0000000183058634 mach_msg_trap + 8
1   libsystem_kernel.dylib          0x0000000183057aa0 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                  0x00000001831ff04c __CFRunLoopServiceMachPort + 216 (CFRunLoop.c:2575)
3   CoreFoundation                  0x00000001831fa16c __CFRunLoopRun + 1444 (CFRunLoop.c:2931)
4   CoreFoundation                  0x00000001831f98a0 CFRunLoopRunSpecific + 464 (CFRunLoop.c:3192)
5   CFNetwork                       0x00000001864bd034 -[__CoreSchedulingSetRunnable runForever] + 192 (CoreSchedulingSet.mm:1372)
6   Foundation                      0x000000018366a0c4 __NSThread__start__ + 848 (NSThread.m:724)
7   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
8   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 16 name:
Thread 16:
0   libsystem_kernel.dylib          0x000000018307a150 __select + 8
1   Ambassador.iOS                  0x00000001043e1e84 mono_poll + 320
2   Ambassador.iOS                  0x000000010436a898 poll_event_wait + 196
3   Ambassador.iOS                  0x000000010436a190 selector_thread + 1152
4   Ambassador.iOS                  0x00000001043795cc start_wrapper_internal + 344
5   Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
6   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
7   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 17 name:
Thread 17:
0   libsystem_kernel.dylib          0x0000000183058688 semaphore_timedwait_trap + 8
1   Ambassador.iOS                  0x000000010436dd6c worker_thread + 848
2   Ambassador.iOS                  0x00000001043795cc start_wrapper_internal + 344
3   Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
4   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
5   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 18 name:
Thread 18:
0   libsystem_kernel.dylib          0x0000000183058688 semaphore_timedwait_trap + 8
1   Ambassador.iOS                  0x000000010436dd6c worker_thread + 848
2   Ambassador.iOS                  0x00000001043795cc start_wrapper_internal + 344
3   Ambassador.iOS                  0x0000000104379450 start_wrapper + 88
4   libsystem_pthread.dylib         0x0000000182f9e1d0 _pthread_start + 124 (pthread.c:895)
5   libsystem_pthread.dylib         0x0000000182fa1ae0 thread_start + 8

Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x0000000000000000   x1: 0x0000000000000000   x2: 0x0000000000000000   x3: 0x0000000000000000
    x4: 0x0000000182eecd65   x5: 0x000000016d1b81a0   x6: 0x0000000000000036   x7: 0xffffffffffffffec
    x8: 0x0000000104af9800   x9: 0x0000000182f99b40  x10: 0x0000000182f95704  x11: 0x0000000000bf3d01
   x12: 0x0000000132cd0000  x13: 0x0000000000004009  x14: 0x0000000132ccc000  x15: 0x0000000000003fff
   x16: 0x0000000000000148  x17: 0x000000018316a5a0  x18: 0x0000000000000000  x19: 0x0000000000000006
   x20: 0x0000000000000407  x21: 0x0000000000000009  x22: 0x0000000104af98e0  x23: 0x0000000132019478
   x24: 0x0000000131e01e40  x25: 0x00000001068bf898  x26: 0x000000013200ae00  x27: 0x000000016d1b9250
   x28: 0x0000000103029c43   fp: 0x000000016d1b8410   lr: 0x0000000182f95774
    sp: 0x000000016d1b83f0   pc: 0x0000000183079ec4 cpsr: 0x40000000
   esr: 0x56000080  Address size fault

Can anyone help me???

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