React-router: Uncaught TypeError: Cannot read property 'type' of undefined

[Deviad]

Version

"react-router-dom": "^4.1.2",
"react-router-redux": "^5.0.0-alpha.6",

Test Case

https://github.com/Deviad/redux-router-playground/blob/under_development_v5/src/epics/epic_posts.js

Steps to reproduce

1. npm start;
2. open http://localhost:3000/posts/new
3. fill the form
4. press the submit button

Expected Behavior

It should show the page it gets redirected to by means of history.push("/")

Actual Behavior

It does redirect but shows in console.log the following error message:
Uncaught TypeError: Cannot read property 'type' of undefined

I logged the contents of my action$ observable for you to see that it's ok.

[timdorr]

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