Internal Server Error for survey module

Hello,

I am using SuiteCRM Version 7.10.33 Sugar Version 6.5.25 (Build 344). Whenever users try to access a specific survey, they got the following error
"# Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at [no address given] to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log."

and in the logs, I see the following:

[Wed Apr 27 12:12:45.441030 2022] [fcgid:warn] [pid 27057:tid 140158372394752] [client X.X.X.X:62849] mod_fcgid: stderr: PHP Notice: Undefined property: SurveyResponses::$email_response_sent in /home/crm/public_html/modules/SurveyResponses/SurveyResponses.php on line 89, referer: http://myserver.com/index.php?entryPoint=survey&id=e5863c32-dd67-83d7-1610-6268ef14612a

Any help would be much appreciated.

In the server error log:

[Wed Apr 27 13:58:18.907159 2022] [fcgid:warn] [pid 12265:tid 140159307847424] [client X.X.X.X:65190] mod_fcgid: read data timeout in 31 seconds, referer: https://myserver.com/index.php?module=Surveys&action=index&parentTab=Engagements
[Wed Apr 27 13:58:18.907218 2022] [core:error] [pid 12265:tid 140159307847424] [client X.X.X.X:65190] End of script output before headers: index.php, referer: https://myserver.com/index.php?module=Surveys&action=index&parentTab=Engagements