Unbeatable Tic-Tac-Toe

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

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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('t1625', 'moves', 'OXXXOO_OX') #1 /usr/local/www/apache24/data/tictactoe/index.php(334): generate('OXXXOO_OX', 't1625') #2 {main} thrown in /usr/local/www/apache24/data/tictactoe/index.php on line 38