Search locks when results do not exist

ASP Runner Pro Build 689 with MYSQL

I find it frequently freezes when I search for a non-existing result.

Example:

If I searched the database for unit 9999 which does not exist it continues to search and it seems like it is freezing, where it should stop and display no records found.

If i click the stop button on the web browser and click back it take me back to the last page.

Units which exist are found instantaneously, and the problem occurs with every table.