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 ('a4cca507a71bf83d78da9a6d56f5b59f', -1, 1513500089, 1513500089, '36932899', 4, 0, 0)

Line : 187
File : sessions.php