Google Analytics iOS Crash Report - Unclear what error

I am facing some glitch in my iOS app.
I am using the Google Analytics SDK to catch crashes on client devices. But the problem is with the content of the crashlog.

NSGenericException Trace: <redacted> <redacted> <redacted> <redacted> <redacted> <redacted> <redacted> <redacted> CFRunLoopRunSpecific CFRunLoopRunInM

      

        
        
        
      

    

I have no more information about the error. If anyone knows what he is talking about, that would be very grateful.

Edit . I cannot use another SDK.