[OpenSIPS-Users] check for NULL values

[Pasan Meemaduma]

Hi Guys,
I have a check for NULL for $tu var in the script, But when the value is missing I'm getting the following error.
ERROR:core:comp_scriptvar: cannot get left var value

WARNING:core:do_action: error in expression at /etc/opensips/opensips.cfg:806
and line 806 contains following.
    if ( $tu != NULL ) {
        remove("location","$tu");
    }

any suggestion on how to test for NULL values without getting above error. I'm using opensips 2.3.5


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