If the state has no State Income Tax, Box 15 should be left blank UNLESS there is an amount in Box 17.
If Box 15, 16 and 17 are blank on your W2, leave them blank on the W2 input screen.
If you you are still having issues, consider deleting the W2 and re-entering it by hand.
If there IS an amount in Box 17, contact the employer since then an entry in Box 15 would be required.
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