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 ('a78a116f7cd7408fa0f5aef44fae8161', -1, 1425198197, 1425198197, '3691baf8', -1, 0, 0)

Line : 172
File : sessions.php