Singe cell references are broken with string indexes

[aarondr77]

df = pd.DataFrame({
    'A': [1, 2, 3, 4, 5, 6, 7, 8, 9],
    'B': [1, 2, 3, 4, 5, 6, 7, 8, 9]
}, index=['a', 'b', 'c', 'd', 'e', 'b', 'g', 'h', 'i'])

mitosheet.sheet(df)

1. Add a new column
2. Open cell editor and press toggle to only edit an individual cell
3. Select the first cell in A
4. Get an error