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Do null value in a date type format.

Hi All,
I have one source which is in date format, and some of the value inside the column is null. I try to map into a target with the same datatype, however it prompt me out an error while I try to
"Exception in component tMSSqlOutput_1 java.sql.SQLException: Only dates in the AD era are net.sourceforge.jtds.jdbc.DateTime.<init>("
It will be ok if I try to put this query inside the filter:
row1.column_name == null?
is the date format cannot be null when i try to use the etl?