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 ('b8e666bff78d64ca8381f00c4ce50eec', -1, 1714006055, 1714006055, '12dc6af1', 7, 0, 0)

Line : 187
File : sessions.php