diff --git a/miniupnpd/upnpsoap.c b/miniupnpd/upnpsoap.c
index e7193c0..997b325 100644
--- a/miniupnpd/upnpsoap.c
+++ b/miniupnpd/upnpsoap.c
@@ -1850,6 +1850,13 @@ GetOutboundPinholeTimeout(struct upnphttp * h, const char * action, const char *
 	rem_port = GetValueFromNameValueList(&data, "RemotePort");
 	protocol = GetValueFromNameValueList(&data, "Protocol");
 
+	if (!int_port || !ext_port || !protocol)
+	{
+		ClearNameValueList(&data);
+		SoapError(h, 402, "Invalid Args");
+		return;
+	}
+
 	rport = (unsigned short)atoi(rem_port);
 	iport = (unsigned short)atoi(int_port);
 	/*proto = atoi(protocol);*/