Text Box #error

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My text box works fine untill I open a new form and there is no data in
[OwnerID] I get a "#error" in my text box,
Control Source below!
=nz(DLookUp("[Payable]","[qryOverdueAll]","[OwnerID] = " & [OwnerID]))

Thanks in advance for any help with this......Bob
MS Access 2007 accdb
Windows  XP Home Edition Ver 5.1 Service Pack 3

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