fix WARNING: /home/piwik/htdocs/plugins/Referrers/Controller.php(422) Warning - Invalid argument supplied for foreach() #11098
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… Warning - Invalid argument supplied for foreach() Reported in https://forum.piwik.org/t/warning-message-plugins-referrers-controller-php-422-warning/22314
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Reported in https://forum.piwik.org/t/warning-message-plugins-referrers-controller-php-422-warning/22314