NullPointerException thrown when trying to sendMessage from ChatManager

Hi,

I'm getting NullPointerException randomly (not always reproducible) when trying to send a Chat message.

Method is sendMessage and it's happening when it tries to make connection().sendPacket(message).

Looking at the code I've seen connection returns a weakReference and it is null when trying to get it. Maybe there is a need of adding a null check for connection on the following method?

void sendMessage(Chat chat, Message message) throws NotConnectedException {   
       for(Map.Entry<MessageListener, PacketFilter> interceptor : interceptors.entrySet()) {     
               PacketFilter filter = interceptor.getValue();         
               if(filter != null && filter.accept(message)) {
                       interceptor.getKey().processMessage(message);         
               }     
       }     
// Ensure that messages being sent have a proper FROM value     
     if (message.getFrom() == null) {         
               message.setFrom(connection().getUser());     
     }     
     connection().sendPacket(message); 
}

Could you please take a look?

The library version is: 4.1.0-beta1 (4.0.6-416-gfd69a4c 2015-01-14)

Thanks in advance!