E_WARNING: strlen() expects parameter 1 to be string, array given
in strlen called at /core/Tracker/Request.php (629)
in Piwik\Tracker\Request::getCustomVariables called at /core/Tracker/Action.php (183)
in Piwik\Tracker\Action::getCustomVariables called at /plugins/CustomVariables/Tracker/CustomVariablesRequestProcessor.php (76)
in Piwik\Plugins\CustomVariables\Tracker\CustomVariablesRequestProcessor::afterRequestProcessed called at /core/Tracker/Visit.php (152)
in Piwik\Tracker\Visit::handle called at /core/Tracker.php (138)
in Piwik\Tracker::trackRequest called at /plugins/BulkTracking/Tracker/Handler.php (56)