Avoid "Request is missing response" in LoadUI Test

Hi,

When I run a timed LoadUI test, I usually get a few errors at the end of the test.  I think this is because LoadUI ends the test at exactly the timed interval.  The errors are displayed in the Global Metrics and the following detail is present for each failure in the log

    Request is missing response

I can set the Max Target Run to something under the expected # of runs but I was wondering if there was a flag that would prompt LoadUI to finish everything started within the time interval window rather than abruptly terminating in-progress requests.

Thank you