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 ('6c638e449f1d5f2c65fe06adfd78fd4a', -1, 1513479284, 1513479284, '36dd4c44', 2, 0, 0)

Line : 187
File : sessions.php