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 ('88708beb2dd9e87c283fff1d5c69bca5', -1, 1714615806, 1714615806, '0391821f', -55, 0, 0)

Line : 187
File : sessions.php