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 ('231f871a3a991c4950c21c8b9f5a4e2e', -1, 1425243105, 1425243105, '369fcd25', -1, 0, 0)

Line : 187
File : sessions.php