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 ('538c4489aa583dc0ff7658ba7edd3009', -1, 1714041455, 1714041455, '038f17b0', 6, 0, 0)

Line : 187
File : sessions.php