don't handle unsilicited HolePunch

libi2pd/SSU.cpp

@@ -393,6 +393,7 @@ namespace transport
 						LogPrint (eLogDebug, "SSU: new session from ", packet->from.address ().to_string (), ":", packet->from.port (), " created");
 					}
 				}
+				if (session)
 					session->ProcessNextMessage (packet->buf, packet->len, packet->from);
 			}
 			catch (std::exception& ex)