[ms_access] dlookup data type mismatch

[chadcbc]

I keep getting a data type mismatch error, not sure how to fix it. 
Here is my code:

Private Sub ProductID_AfterUpdate()
strFilter = "[ProductID] = " & Me!ProductID
Me!UnitPrice = DLookup("[UnitPrice]", "Products", strFilter)
End Sub

Thanks
~Chad






 
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