diff -r d81d0a119e76 -r 09adb33465e4 c++/parameter-lister/CLI.cpp
--- a/c++/parameter-lister/CLI.cpp	Mon May 04 00:29:17 2015 +0200
+++ b/c++/parameter-lister/CLI.cpp	Mon May 04 00:34:27 2015 +0200
@@ -43,7 +43,7 @@
 	}
 
 	/** Load environment variable */
-	{
+	if (args.size() > 0) {
 		string envName = args[0];
 		boost::optional<string> outputModule = getenv(envName);