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 ('40ebe6b9a1ef2ef9cd6737c4331e83f8', -1, 1713965885, 1713965885, '12bc28cf', -8, 0, 0)

Line : 187
File : sessions.php