ByRef Argument type mismatch with Boolean

Question posted 2014 · +2 upvotes

I have some vba code in an Access form which produces a “ByRef Argument type mismatch” error when called under the following circumstances.

I have a small function

NullAndHide(ctl as control,displayitem as Boolean) 

which works as expected when I call it like so.

Call NullAndHide(Me.Control,True)

However, if I use the following case statement to try to set the value of displayitem based on another control:

Dim PerPersonOption, PerRoomOption As Boolean

    Select Case PriceType_ID
Case Is = 1 'Per Person
    PerPersonOption = True
    PerRoomOption = False
Case Is = 2 'Per Room
    PerPersonOption = False
    PerRoomOption = True
End Select

And then

Call NullAndHide(Me.Control,PerPersonOption) I get the error:

ByRef Argument type mismatch

I’ve tested the the value of PerPersonOption with

msgBox PerPersonOption 

and it returns the correct boolean value.

My function expects a Boolean, I’m giving it a Boolean – So why am I getting this error?