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On the file (protected/modules/reports/components/SummationReportGridView.php) change /** * Initializes hidden columns */ public function initColumns () { if (count ($this->hiddenColumns)) { $tmp = $this->columns; $this->columns = $this->hiddenColumns; parent::initColumns (); $this->hiddenColumns = $this->columns; $this->columns = $tmp; } parent::initColumns (); } To /** * Initializes hidden columns */ public function initColumns () { if (is_array($th