Back button not working

Since last week, we've noticed that the Back button in the Prismic header section doesn't work, which is super frustrating for our users. I'm attaching a screenshot from Inspector Tools > Console of the error message that happens when we click the Back button.

I'm experiencing the same bug

Is this on the legacy editor or the new page builder?

Is this going back to the document list?

It's on the legacy editor.

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Thanks, we've been able to replicate it on our side. Currently investigating further.

We've found the cause of the bug @matt5 it should be fixed for you, @kris if you tell me your repo I can fix it for you as well. I've pm'd you.