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 ('6a6cb59f6a1d9dd81faa9f06a8a78ec7', -1, 1713514600, 1713514600, '038aafb4', -7, 0, 0)

Line : 187
File : sessions.php