Ticket #21327: cache_decr_fix.patch

wp-includes/cache.php

@@ -323 +323 @@
          * @return false|int False on failure, the item's new value on success.
          */
         function decr( $key, $offset = 1, $group = 'default' ) {
+                if ( empty( $group ) )
+                        $group = 'default';
+                
                 if ( ! $this->_exists( $key, $group ) )
                         return false;