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 ('494b7aacd39795c4c5ec7b892a4d263c', -1, 1438777552, 1438777552, '6b146ba5', -1, 0, 0)

Line : 172
File : sessions.php