Query failed! You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1

Backtrace:
Array
(
    [0] => Array
        (
            [file] => /home/chessman/public_html/webchess/includes/classes/Database.class.inc
            [line] => 140
            [function] => read_query
            [class] => Database
            [object] => Database Object
                (
                    [queries:protected] => Array
                        (
                        )

                    [read_count:protected] => 6
                    [write_count:protected] => 1
                )

            [type] => ->
            [args] => Array
                (
                    [0] => SELECT rating FROM players WHERE playerID =
                    [1] => 
                    [2] => 15
                    [3] => 
                )

        )

    [1] => Array
        (
            [file] => /home/chessman/public_html/webchess/includes/classes/Database.class.inc
            [line] => 78
            [function] => read_query
            [class] => Database
            [object] => Database Object
                (
                    [queries:protected] => Array
                        (
                        )

                    [read_count:protected] => 6
                    [write_count:protected] => 1
                )

            [type] => ->
            [args] => Array
                (
                    [0] => SELECT rating FROM players WHERE playerID =
                    [1] => 1
                    [2] => 15
                    [3] => 
                )

        )

    [2] => Array
        (
            [file] => /home/chessman/public_html/webchess/includes/chat.inc.php
            [line] => 331
            [function] => query
            [class] => Database
            [object] => Database Object
                (
                    [queries:protected] => Array
                        (
                        )

                    [read_count:protected] => 6
                    [write_count:protected] => 1
                )

            [type] => ->
            [args] => Array
                (
                    [0] => SELECT rating FROM players WHERE playerID =
                    [1] => 1
                )

        )

    [3] => Array
        (
            [file] => /home/chessman/public_html/webchess/messages.php
            [line] => 471
            [args] => Array
                (
                    [0] => /home/chessman/public_html/webchess/includes/chat.inc.php
                )

            [function] => require_once
        )

)