Crash AudioRecorderSessionPropertyListener

Can anyone please help me to interpret this crashed thread?

 

It’s from an app that records and plays audio. From line 2 I understand that the crash happened during audio recording, but what happened during the recording that made it crash?

 

0 libobjc.A.dylib 0x000000018442c910 objc_msgSend + 16
1 AVFAudio 0x000000018ab9f87c AudioRecorderSessionPropertyListener(void*, unsigned int, unsigned int, void const*) + 148
2 AudioToolbox 0x0000000188ecfcc0 AudioSessionPropertyListeners::CallPropertyListenersImp(AudioSessionPropertyListeners const&, unsigned int, unsigned int, void const*) + 740
3 AudioToolbox 0x0000000188fc2a3c AudioSessionPropertyListeners::CallPropertyListeners(unsigned int, unsigned int, void const*) + 220
4 AudioToolbox 0x00000001890060d0 ProcessInterruptionListenerMessage(unsigned int, unsigned int, unsigned int) + 344
5 AudioToolbox 0x0000000189005dc0 HandleAudioSessionCFTypePropertyChangedMessage(unsigned int, unsigned int, void*, unsigned int) + 556
6 AudioToolbox 0x0000000189005328 ProcessDeferredMessage(unsigned int, __CFData const*, unsigned int, unsigned int) + 2028
7 AudioToolbox 0x000000018900484c ASCallbackReceiver_AudioSessionPingMessage + 580
8 AudioToolbox 0x0000000188ec02a8 _XAudioSessionPingMessage + 48
9 AudioToolbox 0x00000001891a7210 mshMIGPerform + 228
10 CoreFoundation 0x0000000185207ae8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
11 CoreFoundation 0x0000000185207230 __CFRunLoopDoSource1 + 436
12 CoreFoundation 0x0000000185204c80 __CFRunLoopRun + 2452
13 CoreFoundation 0x0000000185124da8 CFRunLoopRunSpecific + 548
14 AVFAudio 0x000000018ac0a424 GenericRunLoopThread::Entry(void*) + 160
15 AVFAudio 0x000000018ac34834 CAPThread::Entry(CAPThread*) + 84
16 libsystem_pthread.dylib 0x0000000184e85220 _pthread_body + 268
17 libsystem_pthread.dylib 0x0000000184e85110 _pthread_start + 288
18 libsystem_pthread.dylib 0x0000000184e83b10 thread_start + 0

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