Got error 28 from storage engine

SELECT
`ej_games`.*,
`ej_categories`.`categoryName` as cat
FROM
`ej_games`
INNER JOIN
`ej_categories` ON `ej_categories`.`categoryID` = `ej_games`.`categoryID`
WHERE
`ej_categories`.`categoryID` = '36'
ORDER BY RAND()
LIMIT 0, 50