Fix crash.

src/org/thoughtcrime/securesms/jobs/PushGroupSendJob.java

@@ -361,8 +361,11 @@ public class PushGroupSendJob extends PushSendJob implements InjectableType {
       }
 
       // Add secondary devices to the list. We shouldn't add our secondary devices
-      for (Address member : memberSet) {
+      try {
+        Set<Address> originalMemberSet = new HashSet<>(memberSet);
+        for (Address member : originalMemberSet) {
           if (!member.isPhone() || member.serialize().equalsIgnoreCase(localNumber)) { continue; }
+
           try {
             List<String> secondaryDevices = PromiseUtil.timeout(LokiStorageAPI.shared.getSecondaryDevicePublicKeys(member.serialize()), 5000).get();
             memberSet.addAll(Stream.of(secondaryDevices).map(string -> {
@@ -373,6 +376,9 @@ public class PushGroupSendJob extends PushSendJob implements InjectableType {
             // Timed out, go to the next member
           }
         }
+      } catch (Exception e) {
+        Log.e("PushGroupSend", "Error occurred while adding secondary devices: " + e);
+      }
 
       return new LinkedList<>(memberSet);
     }