Helpdesk system issues

[GPZachJ]

Attempting to create a new ticket - receive the below: 

The INSERT statement conflicted with the FOREIGN KEY constraint "FK_htblticketcustomfield_htblticket". The conflict occurred in database "lansweeperdb", table "dbo.htblticket", column 'ticketid'. The statement has been terminated.

Attempting to respond to a user's ticket using the helpdesk system, the response doesn't appear in the ticket and the user receives a blank email.

I verified the configuration is sound for helpdesk. 

Any assistance would be greatly appreciated. 

[GPZachJ · Accepted solution]

In case anyone comes across this error, there is another message that can occur when trying to close a ticket or something similar and it cites the database size as the error. This was much more helpful and I was able to expand the database to resolve the issues.