fix #1366

libwhisper/WhisperHost.cpp

@@ -82,10 +82,10 @@ void WhisperHost::inject(Envelope const& _m, WhisperPeer* _p)
 	// TODO p2p: capability-based rating
 	for (auto i: peerSessions())
 	{
-		auto w = i.first->cap<WhisperPeer>().get();
-		if (w == _p)
+		auto w = i.first->cap<WhisperPeer>();
+		if (!!w && w.get() == _p)
 			w->addRating(1);
-		else
+		else if(!!w)
 			w->noteNewMessage(h, _m);
 	}
 }
@@ -163,7 +163,9 @@ void WhisperHost::uninstallWatch(unsigned _i)
 void WhisperHost::doWork()
 {
 	for (auto& i: peerSessions())
-		i.first->cap<WhisperPeer>().get()->sendMessages();
+		if (auto w = i.first->cap<WhisperPeer>())
+			if (!!w)
+				i.first->cap<WhisperPeer>()->sendMessages();
 	cleanup();
 }