Trigger After Update does not get Triggered

,

Hifred sean

I am facing a very weird issue. I have some code written in the "Trigger After Update" event of a DCF (Dynamic Choice Field). When I physically choose "empty" from the list in DCF, the trigger gets triggered and the script gets executed, however when I programatically make the DCF as null, the "Trigger After Update" does not get triggered.

if text('Contact Person') = null then
    Phone := null;
    Mobile := null;
    'Email Address' := null
else
    if text('Contact Person') != null then
        let contactPersonRecord := record('Client Contacts',number('Contact Person'));
        Phone := contactPersonRecord.Phone;
        Mobile := contactPersonRecord.Mobile;
        'Email Address' := contactPersonRecord.Email
    end
end