Index: kernel/db/cat_event_handler.php
===================================================================
--- kernel/db/cat_event_handler.php	(revision 14024)
+++ kernel/db/cat_event_handler.php	(working copy)
@@ -2611,7 +2611,7 @@
 		// add EditorsPick to ForcedSorting if needed
 		$config_mapping = $this->Application->getUnitOption($event->Prefix, 'ConfigMapping');
 		if (array_key_exists('ForceEditorPick', $config_mapping) && $this->Application->ConfigValue($config_mapping['ForceEditorPick'])) {
-			$list_sortings = $this->Application->getUnitOption($event->Prefix, 'ListSortings');
+			$list_sortings = $this->Application->getUnitOption($event->Prefix, 'ListSortings', Array ());
 
 			$new_forced_sorting = Array ('EditorsPick' => 'DESC');
 
Index: kernel/db/db_event_handler.php
===================================================================
--- kernel/db/db_event_handler.php	(revision 13936)
+++ kernel/db/db_event_handler.php	(working copy)
@@ -1001,7 +1001,7 @@
 				}
 			}
 
-			$list_sortings = $this->Application->getUnitOption($event->Prefix, 'ListSortings');
+			$list_sortings = $this->Application->getUnitOption($event->Prefix, 'ListSortings', Array ());
 			$sorting_prefix = array_key_exists($event->Special, $list_sortings) ? $event->Special : '';
 			$sorting_configs = $this->Application->getUnitOption($event->Prefix, 'ConfigMapping');
 
Index: kernel/db/db_tag_processor.php
===================================================================
--- kernel/db/db_tag_processor.php	(revision 13936)
+++ kernel/db/db_tag_processor.php	(working copy)
@@ -1473,7 +1473,7 @@
 	 */
 	function getUserSortIndex()
 	{
-		$list_sortings = $this->Application->getUnitOption($this->Prefix, 'ListSortings');
+		$list_sortings = $this->Application->getUnitOption($this->Prefix, 'ListSortings', Array ());
 		$sorting_prefix = getArrayValue($list_sortings, $this->Special) ? $this->Special : '';
 
 		$user_sorting_start = 0;
Index: units/categories/categories_event_handler.php
===================================================================
--- units/categories/categories_event_handler.php	(revision 13987)
+++ units/categories/categories_event_handler.php	(working copy)
@@ -1923,7 +1923,7 @@
 			}
 			else {
 				// sort by parent path on Front-End only
-				$list_sortings = $this->Application->getUnitOption($event->Prefix, 'ListSortings');
+				$list_sortings = $this->Application->getUnitOption($event->Prefix, 'ListSortings', Array ());
 				$list_sortings['']['ForcedSorting'] = Array ("CurrentSort" => 'asc');
 				$this->Application->setUnitOption($event->Prefix, 'ListSortings', $list_sortings);
 			}
Index: units/helpers/list_helper.php
===================================================================
--- units/helpers/list_helper.php	(revision 13936)
+++ units/helpers/list_helper.php	(working copy)
@@ -113,7 +113,7 @@
 		 */
 		function getUserSortIndex(&$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;