php opencart网站500状态

Question

after 2 years, Suddenly if I try to visit an https://www.xxxx.com website built with opencart I get 500 status error, however, when I load the website dashboard and I logon, then I go back to https://www.xxxx.com and it works, I DO NOT get the 500 error status. I have tried the steps above on different clients (chrome) and I get 500 status unless I logon to the dashboard. I checked mysql and apache all running ok, I restarted the digital ocean server (ubuntu 14.04) without luck.I found the following log in the apache error

call to a member function getModule() on a non-object in /var/www/html/catalog/controller/common/footer_modules.php on line 23

why suddenly I am getting this error? code not changed at all. I do not know how to troubleshoot it. I appreciate some detailed steps.

Answer 1

This is resolved by going to dashboard's Settings --> Store -- > maintenance and unchecking maintenance to No. Maintenance tickbox was set to Yes. Somehow the error does not indicate at all the cause. I set it to No and the error disappeared. I am investigating now whether someone hacked the server or someone had access to the server.