usermanger 7 user monitor not working in API

Hi
Our programming team is producing a product related to Mikrotik User Manager version 7 through PHP programming language.
When calling the command (user-manger/user/monitor), PHP hangs and error 505 is observed.
The issue was investigated through the following methods, but no results were obtained.
php ssh
ssh
rest-api
api

What solution do you suggest to solve this issue?
Best Regards

http://forum.mikrotik.com/t/how-to-access-user-total-download-upload-data-from-rest-api-in-user-manager-user/168199/6