Fatal error: Uncaught TypeError: Plugin\ws5_billigerde\lib\PluginHelper::isActive(): Return value must be of type bool, null returned in /var/www/clients/client1/web5/web/plugins/ws5_billigerde/lib/PluginHelper.php(2) : eval()'d code:78 Stack trace: #0 /var/www/clients/client1/web5/web/plugins/ws5_billigerde/Bootstrap.php(2) : eval()'d code(18): Plugin\ws5_billigerde\lib\PluginHelper::isActive() #1 /var/www/clients/client1/web5/web/includes/src/Shop.php(337): Plugin\ws5_billigerde\Bootstrap->boot() #2 /var/www/clients/client1/web5/web/includes/globalinclude.php(70): JTL\Shop::bootstrap() #3 /var/www/clients/client1/web5/web/index.php(7): require('...') #4 {main} thrown in /var/www/clients/client1/web5/web/plugins/ws5_billigerde/lib/PluginHelper.php(2) : eval()'d code on line 78