Index: plugins/CustomVariables/CustomVariables.php
===================================================================
--- plugins/CustomVariables/CustomVariables.php	(revision 5552)
+++ plugins/CustomVariables/CustomVariables.php	(working copy)
@@ -279,7 +279,7 @@
 
 	protected function cleanCustomVarValue($value)
 	{
-		if(!empty($value))
+    if(strlen($value))
 		{
 			return $value;
 		}