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 ('56b52b7a9724b6c5e5be9b8680d1f911', -1, 1481443378, 1481443378, '36cd59c7', -1, 0, 0)

Line : 172
File : sessions.php