Protocols, domains, and ports must match

I'm using Rollbar to track JS errors from client and server side, recently I start receiving this error message SecurityError: Blocked a frame with origin "http://ift.tt/1nmPB1E" from accessing a frame with origin "https://[CDN-url]-ssl.com". Protocols, domains, and ports must match.

And instead of cdn url it can google or facebook pixel, the same time I note a gaps in google analytics data, dunno if it's related or not, but anyway, I don't understand the reason of the first error, because protocols are identical, I'm not using http over https or vice versa.