Error message at my script

[GE 0]

Hello,

I have created my first script:

While 1
   $size = WinGetClientSize('')
   $title = WinGetTitle('')
      If $size[0] = @DesktopWidth And $size[1] = @DesktopHeight Then
         If StringInStr($title,"Steam") Then
            If ProcessExists("connect.exe") Then
               Exit
            Else
               Run ("C:\Program Files\silex technology\SX Virtual Link\Connect.exe", "", "")
            EndIf
            Exit
         EndIf
      EndIf
   Sleep (1000)
WEnd

It works, but if I switch between some windows, then i get the message

Error: Subscript used on non accessible variable.

Can anyone help me? Thank you.

 

[AutoBert 160]

Insert error handling (e.g. IsArray)