I saw the same error in several blogs. Example: https://www.instagram.com/hucilluc/
Here is the result of that print_r:
Requests_Utility_CaseInsensitiveDictionary Object ( [data:protected] => Array ( [content-type] => text/html; charset=utf-8 [cache-control] => private, no-cache, no-store, must-revalidate [pragma] => no-cache [expires] => Sat, 01 Jan 2000 00:00:00 GMT [vary] => Accept-Language, Cookie [content-language] => en [date] => Tue, 04 Dec 2018 19:43:51 GMT [strict-transport-security] => max-age=60 [x-frame-options] => SAMEORIGIN [content-security-policy] => report-uri https://www.instagram.com/security/csp_report/; default-src 'self' https://www.instagram.com; img-src https: data: blob:; font-src https: data:; media-src 'self' blob: https://www.instagram.com https://*.cdninstagram.com https://*.fbcdn.net; manifest-src 'self' https://www.instagram.com; script-src 'self' https://instagram.com https://www.instagram.com https://*.www.instagram.com https://*.cdninstagram.com wss://www.instagram.com https://*.facebook.com https://*.fbcdn.net https://*.facebook.net 'unsafe-inline' 'unsafe-eval' blob:; style-src 'self' https://*.www.instagram.com https://www.instagram.com 'unsafe-inline'; connect-src 'self' https://instagram.com https://www.instagram.com https://*.www.instagram.com https://graph.instagram.com https://*.graph.instagram.com https://*.cdninstagram.com https://api.instagram.com wss://www.instagram.com wss://edge-chat.instagram.com https://*.facebook.com https://*.fbcdn.net https://*.facebook.net chrome-extension://boadgeojelhgndaghljhdicfkmllpafd; worker-src 'self' https://www.instagram.com; frame-src 'self' https://instagram.com https://www.instagram.com https://staticxx.facebook.com https://www.facebook.com https://web.facebook.com https://connect.facebook.net https://m.facebook.com; object-src 'none'; upgrade-insecure-requests [x-content-type-options] => nosniff [x-xss-protection] => 0 [content-length] => 19596 ) )