phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '31ee988a486018c61beda5444c61cc47' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('31ee988a486018c61beda5444c61cc47', -1, 1770980366, 1770980366, 'd849d809', -4, 0, 0)

Line : 187
File : sessions.php