Ticket #59420: 59420.6.patch

wp-includes/IXR/class-IXR-introspectionserver.php

@@ -73 +73 @@
         if (!$this->hasMethod($methodname)) {
             return new IXR_Error(-32601, 'server error. requested method "'.$this->message->methodName.'" not specified.');
         }
-        $method = $this->callbacks[$methodname];
         $signature = $this->signatures[$methodname];
         $returnType = array_shift($signature);