Unbeatable Tic-Tac-Toe

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

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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('t2671', 'moves', 'XXOOOXX_O') #1 /usr/local/www/apache24/data/tictactoe/index.php(334): generate('XXOOOXX_O', 't2671') #2 {main} thrown in /usr/local/www/apache24/data/tictactoe/index.php on line 38