Syslog error related to debugger.php

Hi! We started receiving this alert ever since we enabled syslog. Do we need to worry? Any idea why are we receiving this error log?

Message: Apr 27 11:48:46 slot1/test-f5 err httpd[26783]: [error] [client 10.x.x.x] PHP Warning: file_put_contents(/var/log/ts/xui.log): failed to open stream: Permission denied in /var/ts/dms/common/debugger.php on line 76, referer: