But you know the application and its logic better than any reader.
Your processing is looking for/changing/referencing the time event log and a form may be closed as gasman said. If you put in some values for the parameter and review your related tables, then you may be able to identify the underlying issue.
Does a request for a Time_Event_Log not signal something to you?? Are you expecting some sort of audit/event record when running a particular report? What is the purpose of the Time_Event_Log in your application? Why would something be recorded/displayed during the presentation of a report?
You did write the code, right?