Unbeatable Tic-Tac-Toe

New Game
Make Your Move
O Select Select
X O X
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('t9669', 'moves', 'O__XOX___') #1 /usr/local/www/apache24/data/tictactoe/index.php(334): generate('O__XOX___', 't9669') #2 {main} thrown in /usr/local/www/apache24/data/tictactoe/index.php on line 38