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 ('d18feff1e3733ae52f657d7737a32c5a', -1, 1714621870, 1714621870, '12daea53', -50, 0, 0)

Line : 187
File : sessions.php