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 ('6c4690bc17fa32d3fbc5b00eb5c0c4cd', -1, 1513631007, 1513631007, '36eaf776', 5, 0, 0)

Line : 187
File : sessions.php