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 ('c789a9a5a5fc806509ca2f0d3f0d4c1e', -1, 1714026695, 1714026695, '12db3f5a', -4, 0, 0)

Line : 187
File : sessions.php