1. Have a user without existing User/User talk pages and "Flow on user talk" not enabled in user Preferences.
2. Go to the User or User Talk page and the following will be displayed in Console:
```
TypeError: Cannot read property 'addButton' of undefined TypeError: Cannot read property 'addButton' of undefined
at Object.<anonymous> (http://en.wikipedia.beta.wmflabs.org/w/index.php?
title=ET11&action=edit&redlink=1:240:61)
at jQuery.Callbacks.fire (http://en.wikipedia.beta.wmflabs.org/w/load.php?
debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=PUr9dIEB:45:122
at Object.jQuery.Callbacks.self.fireWith [as resolveWith] (http://en.wikipedia.beta.wmflabs.org/w/load.php?
debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=PUr9dIEB:46:431)
at Object.jQuery.extend.Deferred.jQuery.each.deferred.(anonymous function) [as ready]
(http://en.wikipedia.beta.wmflabs.org/w/load.php?
debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=PUr9dIEB:47:790)
at handlePending (http://en.wikipedia.beta.wmflabs.org/w/load.php?
debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=PUr9dIEB:159:895)
at mw.loader.markModuleReady (http://en.wikipedia.beta.wmflabs.org/w/load.php?
debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=PUr9dIEB:162:254)
at Object.<anonymous> (http://en.wikipedia.beta.wmflabs.org/w/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=PUr9dIEB:162:671)
at jQuery.Callbacks.fire (http://en.wikipedia.beta.wmflabs.org/w/load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=PUr9dIEB:45:122)
```