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 ('5b07571b8fa5f1bfe3d4c6d29902caad', -1, 1513539107, 1513539107, '36a3d2aa', 5, 0, 0)

Line : 187
File : sessions.php