Hello
for showing my Videos in my new Piwigo Gallery I installed the plugin piwigo-videojs and while synchronizing I am getting  follwing error message:

Warning: array_merge(): Argument #1 is not an array in /home/sites/site39/web/piwigo/plugins/piwigo-videojs/admin/admin_sync.php on line 53

Notice: Undefined index: output in /home/sites/site39/web/piwigo/plugins/piwigo-videojs/admin/admin_sync.php on line 66

Warning: array_merge(): Argument #1 is not an array in /home/sites/site39/web/piwigo/plugins/piwigo-videojs/admin/admin_sync.php on line 78

What is wrong? What was my failure? What can I do for debugging?
What additional info do you neeed?

regards
  Alhard


    Piwigo 2.9.5
    Betriebssystem: Linux
    PHP: 7.2.19 (Info anzeigen) [2019-07-21 19:33:22]
    MySQL: 5.5.5-10.2.22-MariaDB-log [2019-07-21 19:33:22]
    Grafikbibliothek: ImageMagick 7.0.8-46
    Piwigo URL: https://galerie.alhardhorstmann.de