iOS keyboard extension crashes before it arrives to any part of the code that we wrote

We are working on developing an keyboard extension for iOS.

And we are receiving crash reports. But reports are not related to code that we wrote but, they happen somewhere before or during the launching of the keyboard extension by the system.

Here is the thread that crashed:

Thread 4 name:   Dispatch queue: com.apple.extension.global-state-queue
Thread 4 Crashed:
0   libsystem_kernel.dylib        	       0x1fa4cd01c __pthread_kill + 8
1   libsystem_pthread.dylib       	       0x21cad6680 pthread_kill + 268
2   libsystem_c.dylib             	       0x1bb8d3bb0 abort + 180
3   libc++abi.dylib               	       0x21ca04660 abort_message + 132
4   libc++abi.dylib               	       0x21c9f462c demangling_terminate_handler() + 348
5   libobjc.A.dylib               	       0x1abd0ed34 _objc_terminate() + 144
6   libc++abi.dylib               	       0x21ca03a24 std::__terminate(void (*)()) + 16
7   libc++abi.dylib               	       0x21ca039c8 std::terminate() + 56
8   libdispatch.dylib             	       0x1bb81b314 _dispatch_client_callout + 40
9   libdispatch.dylib             	       0x1bb822894 _dispatch_lane_serial_drain + 748
10  libdispatch.dylib             	       0x1bb8233c4 _dispatch_lane_invoke + 380
11  libdispatch.dylib             	       0x1bb82e004 _dispatch_root_queue_drain_deferred_wlh + 288
12  libdispatch.dylib             	       0x1bb82d878 _dispatch_workloop_worker_thread + 404
13  libsystem_pthread.dylib       	       0x21cad2964 _pthread_wqthread + 288
14  libsystem_pthread.dylib       	       0x21cad2a04 start_wqthread + 8

Can someone help us to deduce what can cause this crashes from the crash log?

Here is full report:

Thank you