diff --git a/src/upnp.cpp b/src/upnp.cpp
index 4e5f103..2dc7ff1 100644
--- a/src/upnp.cpp
+++ b/src/upnp.cpp
@@ -56,6 +56,7 @@ namespace kuu {
 
 			operator struct UPNPUrls* () { return &urls; }
 			UPNPUrlsWithInitFlag* operator-> () { return this; }
+			bool operator not() const { return not initialized; }
 		};
 
 		//see: http://stackoverflow.com/questions/24611215/one-liner-for-raii-on-non-pointer
@@ -280,7 +281,7 @@ namespace kuu {
 
 				retval.push_back(redir);
 			}
-			else {
+			else if (713 != r) {
 				throw UPNPException(r, "Error in invocation of UPNP_GetGenericPortMappingEntry()", strupnperror(r));
 			}