Slice array / Application.Index type mismatch error

[JackDanIce]

Hi,

Following code errors on highlighted line with Error 13, type mismatch:

Sub Test1()

    Dim x       As Long
    Dim arr()   As Variant

    With Sheets("Sheet1")
        x = .Cells(.Rows.Count, 1).End(xlUp).Row
        arr = .Cells(25, 1).Resize(x - 24, 2).Value
    End With
    
    For x = LBound(arr, 1) To UBound(arr, 1)
        Select Case arr(x, 2)
            Case Is = 1, 2
            Case Else: arr(x, 1) = Null
        End Select
    Next x
    
    With Sheets("Sheet2")
        With .Cells(.Rows.Count, 1).End(xlUp).Offset(1).Resize(UBound(arr, 1))
            .Value = Application.Index(arr, 0, 1)
            .SpecialCells(xlCellTypeBlanks).Delete xlUp
        End With
    End With
    
    Erase arr
    
End Sub

Read various online forums for answers (e.g. declare arr without brackets, size limitations) but nothing suggested removes this error and the data is contained in A25:B35 in Sheet1 only

The below code runs fine (in same workbook), without error, so can't tell if it's syntax related:

Sub Test()
  Dim arr() As Variant
  arr = Cells(1, 1).Resize(3, 2).Value
  Cells(1, 4).Resize(UBound(arr, 1)).Value = Application.Index(arr, 0, 1)
  Cells(1, 5).Resize(UBound(arr, 1)).Value = Application.Index(arr, 0, 2)
  Erase arr
End Sub

Any help on removing the error in the top macro?

TIA, Jack

 

[JackDanIce]

arr(x,1) = vbNullString NOT arr(x,1) = Null

Code is working now