Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 17420)
+++ wp-includes/functions.php	(working copy)
@@ -3034,6 +3034,9 @@
  * @return array A list of objects or object fields
  */
 function wp_filter_object_list( $list, $args = array(), $operator = 'and', $field = false ) {
+	if ( ! is_array( $list ) )
+		return array();
+
 	$list = wp_list_filter( $list, $args, $operator );
 
 	if ( $field )