Full backtrace:

2020-09-23 18:55:29.011 6708-6708/? A/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
2020-09-23 18:55:29.011 6708-6708/? A/DEBUG: Cause: null pointer dereference
2020-09-23 18:55:29.011 6708-6708/? A/DEBUG:     eax c106f4cc  ebx c106f4cc  ecx 00000000  edx 00000000
2020-09-23 18:55:29.011 6708-6708/? A/DEBUG:     edi e0ba1700  esi 00000000
2020-09-23 18:55:29.011 6708-6708/? A/DEBUG:     ebp c1843a28  esp c184396c  eip eae52a62
2020-09-23 18:55:29.015 6708-6708/? A/DEBUG: backtrace:
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #00 pc 00090a62  /apex/com.android.runtime/lib/bionic/libc.so (strlen_generic+18) (BuildId: 76290498408016ad14f4b98c3ab6c65c)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #01 pc 0005126a  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Preferences::Node::find(char const*)+90) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #02 pc 0004d318  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Preferences::Node::addChild(char const*)+152) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #03 pc 0004d266  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Preferences::Fl_Preferences(Fl_Preferences&, char const*)+102) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #04 pc 0003a5df  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl::option(Fl::Fl_Option)+143) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #05 pc 0003c573  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl::visible_focus()+35) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #06 pc 0003bca9  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Button::handle(int)+121) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #07 pc 00046385  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #08 pc 0004579a  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Group::handle(int)+1834) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #09 pc 0005d054  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Window::handle(int)+404) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #10 pc 00038b60  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #11 pc 00037f8b  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl::handle_(int, Fl_Window*)+523) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #12 pc 00037d6b  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl::handle(int, Fl_Window*)+107) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #13 pc 0007d94f  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Android_Screen_Driver::handle_mouse_event(AInputQueue*, AInputEvent*)+927) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #14 pc 0007d530  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Android_Screen_Driver::handle_input_event()+272) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #15 pc 0007dbcc  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Android_Screen_Driver::handle_queued_events(double)+284) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #16 pc 0007dfa5  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Android_Screen_Driver::wait(double)+629) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #17 pc 0003679d  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl::wait(double)+77) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #18 pc 00036899  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl::run()+73) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #19 pc 00035c2d  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (main+253) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #20 pc 0007b30d  /data/app/com.example.flapp-yqEy_UINE98HETAdpmyaDQ==/lib/x86/libnative-lib.so (Fl_Android_Application::thread_entry(void*)+349) (BuildId: 2a1ed97ee370d0ad45a2f3622cd830feb7de7263)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #21 pc 0011a8e5  /apex/com.android.runtime/lib/bionic/libc.so (__pthread_start(void*)+53) (BuildId: 76290498408016ad14f4b98c3ab6c65c)
2020-09-23 18:55:29.016 6708-6708/? A/DEBUG:       #22 pc 000af6a7  /apex/com.android.runtime/lib/bionic/libc.so (__start_thread+71) (BuildId: 76290498408016ad14f4b98c3ab6c65c)

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