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 ('b2a01ef8f9955cdfd2a5b383b734f140', -1, 1709637259, 1709637259, '2cc84d5c', -4, 0, 0)

Line : 187
File : sessions.php