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 ('40f368be6c02a8c4b782866eb5679a29', -1, 1711723954, 1711723954, '2cc11db8', -7, 0, 0)

Line : 187
File : sessions.php