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With a fresh install of Briar, I added and removed a contact. Removing the contact succeeded on one device, but failed repeatedly on the other device with the following exception:

05-31 18:13:01.426 2390-2584/org.briarproject.briar W/ConversationActivity: org.briarproject.bramble.api.db.DbException
    org.briarproject.bramble.api.db.DbException
        at org.briarproject.briar.sharing.SharingManagerImpl.getSession(SharingManagerImpl.java:162)
        at org.briarproject.briar.sharing.SharingManagerImpl.removingShareable(SharingManagerImpl.java:453)
        at org.briarproject.briar.sharing.BlogSharingManagerImpl.removingBlog(BlogSharingManagerImpl.java:70)
        at org.briarproject.briar.blog.BlogManagerImpl.removeBlog(BlogManagerImpl.java:224)
        at org.briarproject.briar.blog.BlogManagerImpl.removingContact(BlogManagerImpl.java:119)
        at org.briarproject.bramble.contact.ContactManagerImpl.removeContact(ContactManagerImpl.java:175)
        at org.briarproject.bramble.contact.ContactManagerImpl.removeContact(ContactManagerImpl.java:137)
        at org.briarproject.briar.android.contact.ConversationActivity$19.run(ConversationActivity.java:810)
        at org.briarproject.briar.android.controller.DbControllerImpl$1.run(DbControllerImpl.java:37)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
        at java.lang.Thread.run(Thread.java:818)

From the stacktrace, it looks like more than one session has somehow been created for sharing the contact's blog. (I didn't share the blog manually.)