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 ('b2b27fe268834b5a8a2647a4fff992c8', -1, 1711708094, 1711708094, '22ce0190', -10, 0, 0)

Line : 187
File : sessions.php