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 ('6ca8738f7f43d9ab81e9d6b94a23db3e', -1, 1713442094, 1713442094, '0390ac73', -9, 0, 0)

Line : 187
File : sessions.php