Failed to execute ‘postMessage’ on ‘DOMWindow’ (...) error on inital load

[gammaw]

Error (see in console): Failed to execute ‘postMessage’ on ‘DOMWindow’: The target origin provided (‘https://www.mixcloud.com’) does not match the recipient window’s origin (‘https://www.mmmnmnm.com’).

Blog posts (debugging hints):

• https://github.com/davidjbradshaw/iframe-resizer/issues/443
• https://github.com/soundcloud/soundcloud-javascript/issues/15#issuecomment-74606450

Other hints:

• Mixcloud API implementation bug (baxgas)?
• Error doesn't occur in Microsoft Edge (Windows 10)