Error polling mpls module for mydevice. ErrorException: Undefined array key "sapDescription" in /srv/librenms/LibreNMS/OS/Timos.php:690 Error polling mpls module for ...

While opening the subscription page, an Firefly III - 500 Internal Server Error is encountered. Unfortunately, this error was not recoverable :(. Firefly III broke ...

How to fix undefined index error in PHP? To avoid this error when using the $ _POST or $ _GET variables, simply test whether the table's fields were initialized with the function isset ().