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 ('8f408158bcf4e40424c570d3f087c4fe', -1, 1714017713, 1714017713, '12deb8a2', -6, 0, 0)

Line : 187
File : sessions.php