Sorry, my English is not good.
My system : Advanced Poll 2.0.9 / windows server 2008 / Xmapp 1.7.7 / Apache
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I found the problem.
If the option is not selected, then press the button (Vote)
Result :
The system saves the option_id == 0.
the system will not have to vote again ("You have already voted!").
Help me
How to check if option (option_id) not selected. ?