--- a/net/server_epoll.lua	Thu Aug 18 15:57:22 2016 +0200
+++ b/net/server_epoll.lua	Thu Aug 18 16:00:51 2016 +0200
@@ -141,7 +141,10 @@
 end
 
 function interface:getfd()
-	return self.conn:getfd();
+	if self.conn then
+		return self.conn:getfd();
+	end
+	return -1;
 end
 
 function interface:ip()