window.opener doesn't work

I have a website that seems to have just broken with the 18 or 18.0.1 release. The specific code that is breaking is a call to window.opener. The error I see in the console says: TypeError: window.opener.Assignments is undefined

I checked this with IE and FF on our test servers as well as our comparison server (runs last releases version of the code) and they all have the same problem so it's not something that changed in our codebase.

Can anyone tell me why there are javascript errors on calls to window.opener with the latest release and how I can work around this?

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