excel – I keep getting an overflow error with this code, anyone know what I am doing wrong

Thought this was right but keep getting errors, need to loop through about 150000 rows in a column and not every row has data or data that is the same but the cells are color coded so that is why I am targeting them, but keep getting overflow error. Any help would be appreciated.

Dim rcell As Range
        For Each rcell In Range("M1:M150000")
        If rcell.Interior.ColorIndex = 6 Then
          rcell.Offset(1, 0).Value = rcell.Value
          rcell.Value = ""
          rcell.Offset(1, 0).Interior.ColorIndex = 4
            End If
          Next rcell

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