phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpBB/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('7748248209c504c11e8a6582936588da', -1, 1469877619, 1469877619, '6b161810', 13, 0, 0)

Line : 187
File : sessions.php