Index: trunk/kernel/units/general/custom_fields.php
===================================================================
diff -u -N -r5289 -r6093
--- trunk/kernel/units/general/custom_fields.php	(.../custom_fields.php)	(revision 5289)
+++ trunk/kernel/units/general/custom_fields.php	(.../custom_fields.php)	(revision 6093)
@@ -9,7 +9,12 @@
 
 	function GetValuesHash($values_list)
 	{
-		$optionValuesStr = trim($this->ParseConfigSQL($values_list), ',');
+		$optionValuesStr = trim($this->ParseConfigSQL($values_list), ',');	
+		if (!$optionValuesStr) {
+			// no options, then return empty array
+			return Array();
+		}
+		
 		$optionValuesTmp = explode(',', $optionValuesStr);
 		$optionValues = Array();
 		foreach ($optionValuesTmp as $optionValue) {