iif() statement in Access -


I have an if statement that is returning #type! Error on my form in login: 

  IIF ([responsible] = null, "unassigned", [responsible])

What do I try to do I am getting a name for the task (which works without expression) to get the name of the specified person back, and when anyone is not assigned, it will return the 'UNASSIGNED' text I will not Knows why this is not working.

As soon as they said, compare taps in T VBA, then do this: 

  IIF (Isunnul ([responsible]), "unassigned", [responsible])

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