phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './b18432_child/phpbb_sessions' is marked as crashed and last (automatic?) repair failed

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('173d1f67bad2d61de5ec93d6a11ae763', -1, 1508548571, 1508548571, '36a6960a', -4, 0, 0)

Line : 193
File : sessions.php