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 ('f56b54e503f0c54ab6dd09d3a233d424', -1, 1713929535, 1713929535, '0d3a524f', 6, 0, 0)

Line : 187
File : sessions.php