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 ('7b8af66a961f4eb8db0a6a065a7f6b57', -1, 1757181749, 1757181749, 'd849d8bb', 5, 0, 0)

Line : 187
File : sessions.php