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 ('835793e97896cbd8bf8722ecd1bbb9e6', -1, 1714017518, 1714017518, '0389b420', -7, 0, 0)

Line : 187
File : sessions.php