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 ('a8ea50977a4bc747be5e1fe274a62b22', -1, 1713917991, 1713917991, '12df6a64', 2, 0, 0)

Line : 187
File : sessions.php