How to fix SIGSEGV (SEGV_MAPERR) error on Android?

Question

Android

Good afternoon!
The task is to use the c ++ library from another Android application that was not written by me.
The library itself is structured like this:
1. There are methods in c++, like Java_com_, to which we connect from java.
2. There are methods in java that are accessed by the code from c++.
I connect to the library, some of the methods work.
And then it gives this error.

10-23 15:32:07.262 29631-29674/com.test.test A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 29674 (Thread-7)
10-23 15:32:07.528 30482-30482/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
10-23 15:32:07.529 30482-30482/? A/DEBUG: Build fingerprint: 'HONOR/LLD-L31/HWLLD-H:8.0.0/HONORLLD-L31/144(C10):user/release-keys'
10-23 15:32:07.529 30482-30482/? A/DEBUG: Revision: '0'
10-23 15:32:07.529 30482-30482/? A/DEBUG: ABI: 'arm'
10-23 15:32:07.529 30482-30482/? A/DEBUG: pid: 29631, tid: 29674, name: Thread-7  >>> com.test.test <<<
10-23 15:32:07.529 30482-30482/? A/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
10-23 15:32:07.529 30482-30482/? A/DEBUG: Cause: null pointer dereference
10-23 15:32:07.529 30482-30482/? A/DEBUG:     r0 dd868f00  r1 c77bfbe4  r2 c77bfbe0  r3 c77bfc98
10-23 15:32:07.529 30482-30482/? A/DEBUG:     r4 c77e4bac  r5 00000000  r6 c77bfc28  r7 c330147d
10-23 15:32:07.529 30482-30482/? A/DEBUG:     r8 c77bfe70  r9 00000000  sl b5ea9328  fp c77bfd54
10-23 15:32:07.529 30482-30482/? A/DEBUG:     ip c6d6208c  sp 00000000  lr 00000000  pc 00000000  cpsr 600f0010
10-23 15:32:07.529 30482-30482/? A/DEBUG: backtrace:
10-23 15:32:07.529 30482-30482/? A/DEBUG:     #00 pc 00000000  <unknown>

Question - what could it be? In which direction to dig? What do you advise?
Maybe you can somehow learn more backtrace?
In what cases can there be a SEGV_MAPERR error, can you please write specific examples?
I see that some pointer is null, but in another application that uses this library, everything works.
So the problem is on the application side, not c++.
Assets are the same, all functions in the java code are there (otherwise, when accessing a non-existent function, it would be a JNI_Error).
Maybe there are no resources from the res folder? Although that shouldn't be the reason.
What do you think?