Ticket #37415: 37415.patch

wp-includes/meta.php

@@ -1139 +1139 @@
 function get_registered_meta_keys( $object_type ) {
         global $wp_meta_keys;
 
+        if ( ! is_array( $wp_meta_keys ) ) {
+                return array();
+        }
+
         if ( ! isset( $wp_meta_keys[ $object_type ] ) ) {
                 return array();
         }