VB6 program gets err 340 Control array element '0' doesn't exist after unload of form

I had the same issue with some textboxes in two of my programs. They would load just fine the first time that the form was loaded, but I kept on getting a "340 error" when I reloaded the form (after an unload command, of course) and when used the "textbox(xx).setfocus" method. After hours of searching, I found out that the error was generated only in specific forms in which I had declared an object variable (let's call it LastObject) that I use in order to reset the focus at the last used textbox, after clicking on a button.

Let's see the code:

Dim LastObject As Object

Private Sub Form_Activate()
 Set LastObject = InpText(1)
 InpText(1).SetFocus
End Sub

This triggered the "340 Control array... error". So, after hours of searching (as I said before), I found that if I assigned the LastObject value after the form was loaded and activated, or after I was done with all the manipulations of the controls in the Form_Activate sub, I got no error. For instance, this:

Private Sub Form_Activate()
 InpText(1).SetFocus
 blah blah
 blah blah
 Set LastObject = InpText(1)
End Sub

...or this:

Private Sub Form_Activate()
 InpText(1).SetFocus
 blah blah
 blah blah
 SetLastObject
End Sub

Private Sub SetLastObject()
 Set LastObject = InpText(1)
End Sub

...both work just fine in my programs now.

I hope this was helpful.