Index: branches/unlabeled/unlabeled-1.79.4/core/kernel/db/db_event_handler.php
===================================================================
diff -u -r6914 -r7015
--- branches/unlabeled/unlabeled-1.79.4/core/kernel/db/db_event_handler.php	(.../db_event_handler.php)	(revision 6914)
+++ branches/unlabeled/unlabeled-1.79.4/core/kernel/db/db_event_handler.php	(.../db_event_handler.php)	(revision 7015)
@@ -726,7 +726,7 @@
 				if (isset($custom_filters[$grid_name])) {
 					foreach ($custom_filters[$grid_name] as $field_name => $field_options) {
 						list ($filter_type, $field_options) = each($field_options);
-						if ($field_options['value']) {
+						if (isset($field_options['value']) && $field_options['value']) {
 							$filter_type = ($field_options['sql_filter_type'] == 'having') ? HAVING_FILTER : WHERE_FILTER;
 							$filter_value = str_replace(EDIT_MARK, $edit_mark, $field_options['value']);
 							$object->addFilter($field_name, $filter_value, $filter_type, FLT_CUSTOM);