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 ('69acc518470b41417e883d942d649d44', -1, 1714000921, 1714000921, '0d3b7aa2', -4, 0, 0)

Line : 187
File : sessions.php