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 ('48c2e4f9b07f0c98e58482f1a6f43ff5', -1, 1711632533, 1711632533, '2ccee341', -4, 0, 0)

Line : 187
File : sessions.php