CustomPiwikJs Error

I get this error everything I active or deactivate a plugin.

plugins/CustomPiwikJs/TrackingCode/PluginTrackerFiles.php(55): Warning - Invalid argument supplied for foreach() - Piwik 3.0.1

plugins/CustomPiwikJs/TrackingCode/PluginTrackerFiles.php(65): Warning - Invalid argument supplied for foreach() - Piwik 3.0.1

Hello, could you please report this bug in our issue tracker: Issues · piwik/piwik · GitHub

Thanks