Unbeatable Tic-Tac-Toe

New Game
Make Your Move
O Select X
X O Select
Select Select Select

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Fatal error: Uncaught Error: Call to a member function getElementsByTagName() on null in /usr/local/www/apache24/data/tictactoe/index.php:38 Stack trace: #0 /usr/local/www/apache24/data/tictactoe/index.php(113): update_element('t7174', 'moves', 'O_XXO____') #1 /usr/local/www/apache24/data/tictactoe/index.php(334): generate('O_XXO____', 't7174') #2 {main} thrown in /usr/local/www/apache24/data/tictactoe/index.php on line 38