If the Fatal condition is ticked subsequent runs will go launch refused, if not ticked then a second run will wait till the first is completed. Also check the time at the bottom of the condition to see if this is same day or any day.
This is for a simple single Uproc launch, if the Uproc is part of a session then need to be careful as there will be a split second when the Uproc is not running and the next has not started.
Do you have more context?
This condition Subsequent run will wait till first is complete
Fatal condition Subsequent run will go launch refused if another run of the same Uproc