phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO satshop_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('5d1fb40c2098c7ddf2b2f8cf2e0fc1ae', -1, 1752883896, 1752883896, 'd849d904', -7, 0, 0)

Line : 189
File : sessions.php