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 ('b6c716e0d81d6798ef906a6cc24ac872', -1, 1711709622, 1711709622, '1716ec5a', -2, 0, 0)

Line : 187
File : sessions.php