diff --git a/x2engine/protected/modules/reports/components/SummationReportGridView.php b/x2engine/protected/modules/reports/components/SummationReportGridView.php
index da485de7e..2bc84c107 100644
--- a/x2engine/protected/modules/reports/components/SummationReportGridView.php
+++ b/x2engine/protected/modules/reports/components/SummationReportGridView.php
@@ -104,7 +104,7 @@ public function registerClientScript() {
      * Initializes hidden columns 
      */
     public function initColumns () {
-        if (count ($this->hiddenColumns)) {
+        if (is_array($this->hiddenColumns) && count ($this->hiddenColumns)) {
             $tmp = $this->columns;
             $this->columns = $this->hiddenColumns;
             parent::initColumns ();