Having trouble with apache and suphp

Hello every body!
I have nginx_apache web server (last version) on my Direct Admin server with CentOS.
I have installed two php:
First: 7.2 with suphp
Second: 5.6 with fastcgi

today I wanted to open a page on my server that I faced with 502 Bad Gateway error and checked the nginx error log and it was empty! so I went to open apache's error log and found this log:

[Sun Feb 11 19:14:01.346482 2018] [mpm_event:notice] [pid 24154:tid 140188786718656] AH00491: caught SIGTERM, shutting down

then I informed with DA message system that "apache is currently down". So I tried to restart/start it but this action failed because of this error:

Starting httpd: AH00526: Syntax error on line 49 of /usr/local/directadmin/data/users/admin/httpd.conf:
Invalid command 'suPHP_Engine', perhaps misspelled or defined by a module not included in the server configuration

Anybody could help me?
Thanks

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