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 ('851aa717d87be8ff09b5ad8d12f10579', -1, 1713455502, 1713455502, '1275b6b3', 3, 0, 0)

Line : 187
File : sessions.php