IllegalStateException when navigating out of combined feed and back in

Steps to reproduce:

Sign into Briar
Open combined blog feed via nav drawer
Return to contact list via back button
Open combined blog feed via nav drawer

Apparently the controller instance is being reused, and it doesn't expect to have a new listener attached.

09-02 12:34:44.543 20694-20694/? E/ACRA: ACRA caught a IllegalStateException for org.briarproject
  java.lang.IllegalStateException: Listener was already set
    at org.briarproject.android.blogs.BaseControllerImpl.setOnBlogPostAddedListener(BaseControllerImpl.java:89)
    at org.briarproject.android.blogs.FeedControllerImpl.setOnBlogPostAddedListener(FeedControllerImpl.java:20)
    at org.briarproject.android.blogs.FeedFragment.injectFragment(FeedFragment.java:85)
    at org.briarproject.android.fragment.BaseFragment.onActivityCreated(BaseFragment.java:39)
    at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1983)