Beim Start des Backend-Modules Themes kommt folgende Warnung:
Warning: Invalid argument supplied for foreach() in /.../httpdocs/system/modules/core/library/Contao/Controller.php on line 114
#0 .../system/modules/core/library/Contao/Controller.php(114): __error(2, 'Invalid argumen...', '/var/www/vhosts...', 114, Array)
#1 .../system/modules/merger2/dca/tl_module.php(63): Contao\Controller::getTemplateGroup('merger_')
...
#8 {main}
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