Fix crash

src/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -1533,10 +1533,10 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
   }
 
   private void onSecurityUpdated() {
-    Log.i(TAG, "onSecurityUpdated()");
+    if (recipient != null) {
-    updateReminders(recipient.hasSeenInviteReminder());
       updateDefaultSubscriptionId(recipient.getDefaultSubscriptionId());
     }
+  }
 
   protected void updateReminders(boolean seenInvite) {
     Log.i(TAG, "updateReminders(" + seenInvite + ")");