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 ('36e2244669c2cebc48bc0ae048676d18', -1, 1714614444, 1714614444, '12d87b78', -50, 0, 0)

Line : 187
File : sessions.php