Collection was modified; enumeration operation may not execute using Messageing Center

I get the above exception on the following line.

  MessagingCenter.Send<ViewModelBase, string>(this, Constants.MsssageNames.ObjectUpdated, GetType().Name);

it is because in the subscriber im trying to unsubscribe when handling the message.

You should guard against this because it is in the subscriber where I know I want to unsubscribe.