phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1194 Table '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 ('5615bbbd4ab5f517fe90a5c1d0e5ed6f', -1, 1438228983, 1438228983, '36f2864d', -1, 0, 0)

Line : 172
File : sessions.php