Problem with user httpd.conf

Hi! I have problem with user conf. When I want to change version of php or save something to .....users/userX/httpd.conf first I have error ERR_EMPTY_RESPONSE
When I save it again then Can't get lock on user's config: /usr/local/directadmin/data/users/userX/httpd.conf
Something wrong with permisson? This problem is only at 1 user

ls -l

-rw-r--r-- 1 diradmin szukamprac 10130 Dec 7 23:28 httpd.conf
-rwx------ 1 diradmin diradmin 0 Dec 8 07:33 httpd.conf.lock
-rw-r--r-- 1 diradmin diradmin 0 Dec 8 07:33 httpd.conf.temp