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 ('2e48b3d5d4ca7c32e0f207010580b756', -1, 1714094176, 1714094176, '12e03be7', -8, 0, 0)

Line : 187
File : sessions.php