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Android NDK Crashanalytics error sending log to firebase. (C ++)

I'm using Firebase on android ndk (including Crashanalytics.h header). At first I can send logs to firabase, but when an error occurs in the application it is not possible to send the log in the function that identifies the error.

In JNI_Load

firebase::crashlytics::Initialize();
firebase::crashlytics::Log("Testing "); // Here it is sent normal to firebase

struct sigaction act;
act.sa_sigaction = handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV, &act, &act_old);
  
void handler(int signum, siginfo_t* info, void* contextPtr)
{
    ucontext* context = (ucontext_t*)contextPtr;

    if (act_old.sa_sigaction)
        act1_old.sa_sigaction(signum, info, contextPtr);
  
  // logic here
  
  firebase::crashlytics::Log(buffer); // Here it stops the code execution and doesn't insert anything else to firebase
  
}
    

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What is the right way to do this, I also tried to create a thread to execute this code. But still nothing is uploaded to firebase.