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 ('8c215243b16c2bb9d05ed396bcc554af', -1, 1710830101, 1710830101, '03e6806a', -7, 0, 0)

Line : 187
File : sessions.php