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 ('4b476455f91da3878edc3817f528c560', -1, 1711709395, 1711709395, '03ecab44', -7, 0, 0)

Line : 187
File : sessions.php