131,132c131,132
<         	// allow empty pubsub messages (OF-191)
<         	if (message.getChildElement("event", "http://jabber.org/protocol/pubsub#event") == null)
---
>         	// allow empty pubsub messages (OF-191) and empty MUC invitations
>         	if (message.getChildElement("event", "http://jabber.org/protocol/pubsub#event") == null && message.getChildElement("x", "http://jabber.org/protocol/muc#user")==null)
134c134
<         		return; 
---
>         		return;
135a136,137
>         	
>         	
145c147
<             // Do not store messages sent to users of remote servers
---
>             // Do not store messages sent to users of remote servers