Hangman game: More than 1 similar alphabet in a question don't become visible after right input

Suppose I have word Banana now if I enter 'n' then it will reveal 'n' which is present at first but the second 'n' will not reveal or I say it will not become visible. And if I enter 'n' again then it will think that I have entered same alphabet twice and then it will not accept and that's how just because of this bug i LOOSE. So this must be resolved so that it can be used.
