When "FOR %a %a IN A B C" is executed, CurrentScriptFile->CurrentCommand->Data is NULL. But the code assumes it's not NULL and tries to deference it. The patch fixes this issue. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>