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Index: core/kernel/db/cat_event_handler.php
===================================================================
--- core/kernel/db/cat_event_handler.php	(revision 12596)
+++ core/kernel/db/cat_event_handler.php	(working copy)
@@ -2261,6 +2261,11 @@
 	 */
 	function processAdditionalCategories(&$object, $mode)
 	{
+		if (!array_key_exists('MoreCategories', $object->VirtualFields)) {
+			// given category item doesn't require such type of processing
+			return ;
+		}
+
 		$process_categories = $object->GetDBField('MoreCategories');
 		if ($process_categories === '') {
 			// field was not in submit & have default value (when no categories submitted, then value is null)