NaN problem in dhtmlxGrid

Hello i have dhtmlx 2.5 pro version.

In column of type “edn” and “dhxCalendarA” when i modify the data and write a incorrect type of data, for example in numeric field i write “test”, when i move the focus out of the field, “NaN” value appears.

There is a any way to set a default correct value in case of error?

Thanks in advance