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 ('64b23ebf56a2fae76d48c4d47011795c', -1, 1713998042, 1713998042, '12bfca48', -8, 0, 0)

Line : 187
File : sessions.php