Run-time error '91': Object variable or With block variable not set when closing userform

I just realized what my error was. I had:

Private Sub UserForm_Initialize()
   DashBoardUF.Show
End Sub

and

Private Sub Workbook_Open()
   DashBoardUF.Show (vbModeless)
End Sub

Once I deleted UserForm_Initialize() code it works fine.

Thanks for your quick response though!