phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f20d5e5345bc554d84c13db3579daf2f', -1, 1710847568, 1710847568, '36dd9fbc', -10, 0, 0)

Line : 187
File : sessions.php