Fatal error on logging with uploads about cakephp-databaselog HOT 7 CLOSED

public function addAttachments()
    {
        $application = $this->Applications->get($this->request->getData('foreign_key'), ['contain' => [], 'fields' => ['id', 'user_id']]);
        if (empty($application)) {
            $this->response->body('Failure');
                $this->response->statusCode(403);
                $this->set([
                        'errors' => 'The application does not exist',
                        'message' => 'Failure', 
                        '_serialize' => ['errors','message']]);
                    return;
        }

        //$category = $this->request->getData();
        if ($this->request->is('post')) {
            $application = $this->Applications->patchEntity($application, $this->request->getData());
            if ($this->Applications->save($application)) {
                $this->set([
                        'message' => 'Success', 
                        //'category' => $category,
                        'content' => $application['attachments'],
                        '_serialize' => ['message', 'content', 'category']]);
                    return;
            } else {
                $this->response->body('Failure');
                $this->response->statusCode(403);
                $this->set([
                        'errors' => $application->errors(),
                        'message' => 'Failure', 
                        '_serialize' => ['errors','message']]);
                    return;
            }
        }
        $this->set(compact('application'));
        $this->set('_serialize', ['application']);
    }