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 ('23cbd2a486f5af8742e3f3f4e4333507', -1, 1710831081, 1710831081, '6419280b', -11, 0, 0)

Line : 187
File : sessions.php