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 ('2b3c7c43a4eda0494a6d2d651be00c3a', -1, 1714001102, 1714001102, '12dfab0c', -4, 0, 0)

Line : 187
File : sessions.php