Index: branches/5.1.x/core/units/helpers/list_helper.php
===================================================================
diff -u -N -r13159 -r14027
--- branches/5.1.x/core/units/helpers/list_helper.php	(.../list_helper.php)	(revision 13159)
+++ branches/5.1.x/core/units/helpers/list_helper.php	(.../list_helper.php)	(revision 14027)
@@ -113,7 +113,7 @@
 		 */
 		function getUserSortIndex(&$list)
 		{
-			$list_sortings = $this->Application->getUnitOption($list->Prefix, 'ListSortings');
+			$list_sortings = $this->Application->getUnitOption($list->Prefix, 'ListSortings', Array ());
 			$sorting_prefix = getArrayValue($list_sortings, $list->Special) ? $list->Special : '';
 
 			$user_sorting_start = 0;