if (instance.getSettings().minSpareCols &&
      data[i][1] + 1 + instance.getSettings().minSpareCols === instance.countCols()
      && emptyColsAtTheEnd == instance.getSettings().minSpareCols) {
        instance.alter('remove_col', parseInt(data[i][1]+1,10), instance.getSettings().minSpareCols);