Undefined Index Notice, Bugsnag/Stacktrace.php Lines 26-27.

Resolves:

PHP Notice:  Undefined index: file in /bugsnag/bugsnag/src/Bugsnag/Stacktrace.php on line 26
PHP Notice:  Undefined index: file in /bugsnag/bugsnag/src/Bugsnag/Stacktrace.php on line 27