Demo page not working

[Kedryn]

i was interested in this project, but the demo pages is not working

"Fatal error: Uncaught Error: Call to a member function bind_param() on bool in /home/admin/web/demo.status.sajdl.com/public_html/classes/user.php:227 Stack trace: #0 /home/admin/web/demo.status.sajdl.com/public_html/admin/index.php(28): User::login() #1 {main} thrown in /home/admin/web/demo.status.sajdl.com/public_html/classes/user.php on line 227"