This code crashes excel (unless the VBA editor is open)

[RawlinsCross]

Good day,

I have the following code that was crashing my excel when it executed. Oddly enough (and by accident), I discovered that when the VBA editor is open, the code runs fine. So I know how it's happening but not why it's happening.
Any thoughts to why this is happening and perhaps suggestions to replace the code with something more robust?

Dim UForm As Object

For Each UForm In VBA.UserForms
    If UForm.Name = "UserGUI" Then
        Exit Sub
    End If
Next UForm

 

[mikerickson]

wouldn't

Set UForm = ThisWorkbook.VBProject.VBComponents("UserGUI")

do the same