diff --git a/libraries/chart/pChart/pData.class b/libraries/chart/pChart/pData.class
index 49d2fcc56..efc2a6508 100644
--- a/libraries/chart/pChart/pData.class
+++ b/libraries/chart/pChart/pData.class
@@ -52,7 +52,7 @@
 
    function pData()
     {
-     $this->Data                           = "";
+     $this->Data                           = array();
      $this->DataDescription                = "";
      $this->DataDescription["Position"]    = "Name";
      $this->DataDescription["Format"]["X"] = "number";