phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpBB/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 ('9364dd418d1fb23189f46c7afc4828d1', -1, 1455233798, 1455233798, '36c4e8a2', 29, 0, 0)

Line : 187
File : sessions.php