I'm using multiple -SET options and invoking a SAS script. I'm getting an ERROR when there is NULL value in one of the -SET value.

Shell Script:::::
FILE_PATH=/temp/12816049.csv
ERROR_MSG=
ID=
/sasapp/uat/sas94/config/comp/Lev1/SASApp/sas.sh /temp/Metrics.sas -SET FILE_PATH "$FILE_PATH" -SET ERROR_MSG "$ERROR_MSG" -SET ID "$ID" -log /temp/Metrics.log

ERROR:::::
ERROR: INVALID OPTION VALUE, FOR SAS OPTION SET