.signal(this)//
.build()//
.post();
}
conversation.left(message.getFrom());
<BUG>}
protected void checkPrecondition(InternalMessage message, Optional<Conversation> conversation) {</BUG>
if (!conversation.isPresent()) {
throw CONVERSATION_NOT_FOUND.exception();
}

.signal(this)//
.build()//
.post();
}
conversation.left(message.getFrom());
}
@Override
protected void checkPrecondition(InternalMessage message, Optional<Conversation> conversation) {
if (!conversation.isPresent()) {
throw CONVERSATION_NOT_FOUND.exception();
}
