Version

3.0.2

Reproduction link

https://github.com/yegorLitvinov/vue-router-bug

Steps to reproduce

Set scrollBehavior property in router config. Put two forward slashes into beginning of the url (e.g. http://localhost:8081//about)

What is expected?

No errors in console

What is actually happening?

In firefox: SecurityError: The operation is insecure.
In Chrome: Uncaught DOMException: Failed to execute 'replaceState' on 'History': A history state object with URL 'http://about/' cannot be created in a document with origin 'http://localhost:8081' and URL 'http://localhost:8081//about'