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 ('2cfcf1d23851e9c3d99ba8e42580d0f1', -1, 1713421286, 1713421286, '12e2b9cf', -4, 0, 0)

Line : 187
File : sessions.php