public function issueClose(\sb\Gitlab\Issue $issue){
        $response = $this->_client->get("/projects/".$this->id."/issues/".$issue->id, [
            'state_event' => 'close'
        ], 'PUT');
        
        if(is_object($response) && isset($response->message)){
             throw new \Exception("Could not close issue ".$issue->id." on project ".$this->id.": ".json_encode($response));
        }
        
        return $response;
    }