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Attempt to invoke virtual method 'void android.preference.Preference.onPrepareForRemoval()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.preference.Preference.onPrepareForRemoval()' on a null object reference	at android.preference.PreferenceGroup.removePreferenceInt(PreferenceGroup.java:188)	at android.preference.PreferenceGroup.removePreference(PreferenceGroup.java:181)	at org.thoughtcrime.securesms.RecipientPreferenceActivity$RecipientPreferenceFragment$2.onSuccess(RecipientPreferenceActivity.java:301)	at org.thoughtcrime.securesms.RecipientPreferenceActivity$RecipientPreferenceFragment$2.onSuccess(RecipientPreferenceActivity.java:294)	at org.thoughtcrime.securesms.util.concurrent.SettableFuture.notifyListener(SettableFuture.java:110)	at org.thoughtcrime.securesms.util.concurrent.SettableFuture.notifyAllListeners(SettableFuture.java:104)	at org.thoughtcrime.securesms.util.concurrent.SettableFuture.set(SettableFuture.java:47)	at org.thoughtcrime.securesms.util.IdentityUtil$1.onPostExecute(IdentityUtil.java:44)	at org.thoughtcrime.securesms.util.IdentityUtil$1.onPostExecute(IdentityUtil.java:28)	at android.os.AsyncTask.finish(AsyncTask.java:651)