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It probably means that you have no results, so $results is not an array.
mysql_function(): WARNING: This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQLextension should be used. See also MySQL: choosing an API guide and related FAQ for more information.
That would make sense except that I can test the query in Facebook's developer tools and it returns the same results every time. Man, Facebook app development is frustrating..