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 ('3b5ecf7c0e91ab1246b0e8db9c80982e', -1, 1513497796, 1513497796, '36932899', 4, 0, 0)

Line : 187
File : sessions.php