phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpbb_1/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) VALUES ('50b6894c6602cf9e00e12d217b894914', -1, 1455490597, 1455490597, '36c4f4f5', 12, 0)

Line : 158
File : /forum/includes/sessions.php