sentry ios stacktrace shows _hidden

I’m having difficulties figuring out the what the crash is about on Sentry.

The stacktrace is as shown below.

OS Version: iOS 11.4.1 (15G77)
Report Version: 104

Exception Codes: BUS_NOOP at 0x00000001042ce0b0
Crashed Thread: 7

Application Specific Information:
onErrorImpl >>  > pMethodNf > src/ActiveDispatcher.cpp > Update registration >
Attempted to dereference garbage pointer 0x1042ce0b0.

Thread 7 Crashed:
0   <unknown>                       0x1042ce0b0         _hidden#4714_
1   TwilioChatClient                0x104054908         _hidden#16662_
2   TwilioChatClient                0x104063188         _hidden#16797_
3   TwilioChatClient                0x103d89364         _hidden#4205_
4   TwilioChatClient                0x103d85388         _hidden#4104_
5   libsystem_pthread.dylib         0x303870220         <redacted>
6   libsystem_pthread.dylib         0x303870110         _pthread_startOS 

Debug Information format is set to DWARF with dSYM file

fastlane for uploading dsym looks like this

version = get_version_number(xcodeproj: "")
download_dsyms(version: version, build_number: latest_testflight_build_number.to_s)
  auth_token: '',
  org_slug: '',
  project_slug: '',

I also tried this command to upload BCSymbolMaps

sentry-cli upload-dif --symbol-maps path/to/symbolmaps path/to/debug/symbols

Does anyone have any idea what I am missing?