Clearing date filter in one of the report causing NAV to crash

Hello All,

I have designed one report which needs ReqFilterFields as Date Filter.

I have added date filter in the property.Now,When I run the report by applying date filter,the report runs just fine.Again,If I run the report and try to clear the previous date filter and press TAB and try to run then the NAV is being crashed.What could be the reason here?