Ticket #4625: 4625.diff

wp-includes/plugin.php

@@ -57 +57 @@
                                 $string = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
                         }
 
-        } while ( next($wp_filter[$tag]) );
+        } while ( next($wp_filter[$tag]) !== false );
 
         return $string;
 }