Possible fund loss if winner == address(0).
When distributing tokens to winners the address of the winner is not checked to be non zero which could result in sending tokens to the 0 address if the token allows for transfers to the 0 address.
If a 0 address in the winners array was a mistake then the organizer could lose funds unnecessarily.
Manual
Check that the address of the winner is not 0 before transferring tokens and revert if it is.
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