Index: kernel/db/dblist.php
===================================================================
--- kernel/db/dblist.php	(revision 13756)
+++ kernel/db/dblist.php	(working copy)
@@ -933,14 +933,22 @@
 			$foreign_key_field = $this->Application->getUnitOption($this->Prefix, 'ForeignKey');
 			if (is_array($foreign_key_field)) $foreign_key_field = getArrayValue($foreign_key_field, $parent_prefix);
 
-			if (!$parent_table_key || !$foreign_key_field) return ;
+			if (!$parent_table_key || !$foreign_key_field) {
+				return ;
+			}
 
 			$parent_object =& $this->Application->recallObject($parent_prefix.'.'.$special);
-			$parent_id = $parent_object->GetDBField($parent_table_key);
+			/* @var $parent_object kDBItem */
 
-			if (!$parent_id) return ;
+			if (!$parent_object->isLoaded()) {
+				$this->addFilter('parent_filter', 'FALSE');
+				trigger_error('Parent ID not found (prefix: "<strong>' . rtrim($parent_prefix.'.'.$special, '.') . '</strong>"; sub-prefix: "<strong>' . $this->getPrefixSpecial() . '</strong>")', E_USER_NOTICE);
+				return ;
+			}
 
-			$this->addFilter('parent_filter', '`'.$this->TableName.'`.`'.$foreign_key_field.'` = '.$parent_id);	// only for list in this case
+			// only for list in this case
+			$parent_id = $parent_object->GetDBField($parent_table_key);
+			$this->addFilter('parent_filter', '`' . $this->TableName . '`.`' . $foreign_key_field . '` = ' . $this->Conn->qstr($parent_id));
 		}
 	}