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 ('934f69d0c102490978be0f1cd8040f9b', -1, 1714000911, 1714000911, '340e7e4a', -4, 0, 0)

Line : 187
File : sessions.php