Xamarin Forms app is crashing with unknown reason

Hello guys

I have a lot of crash reports in Google Play Console for my xamarin.forms app without any understandable stack trace and possibility to get the reason of the issue. There is only the message below:

tgkill

backtrace:
  #00  pc 000000000004a230  /system/lib/libc.so (tgkill+12)
  #01  pc 00000000000479c3  /system/lib/libc.so (pthread_kill+34)
  #02  pc 000000000001d9c5  /system/lib/libc.so (raise+10)
  #03  pc 0000000000019511  /system/lib/libc.so (__libc_android_abort+34)
  #04  pc 0000000000017150  /system/lib/libc.so (abort+4)
  #05  pc 0000000000284ec4  /data/app/com.nyxbull.nswallet-2/lib/arm/libmonosgen-2.0.so

That's it.
Could anybody help me to understand how to catch actual reason of the issue in this case?

Thanks!