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 ('d256a064c1874b91e2454413122aa2cf', -1, 1481443367, 1481443367, '36cd59c7', -1, 0, 0)

Line : 172
File : sessions.php