phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './twisty_phpb1/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 ('5570c7ccd3453a55ab8c49cc9e5fe698', -1, 1513603318, 1513603318, '36f2cd21', 4, 0, 0)

Line : 187
File : sessions.php