diff --git a/demo/arg_parser_demo.cc b/demo/arg_parser_demo.cc
--- a/demo/arg_parser_demo.cc
+++ b/demo/arg_parser_demo.cc
@@ -46,7 +46,7 @@
     .refOption("grb","Choice B",g2)
     .refOption("grc","Choice C",g3)
     .optionGroup("gr","gra")
-    .optionGroup("gr","grbkk")
+    .optionGroup("gr","grb")
     .optionGroup("gr","grc")
     .mandatoryGroup("gr")
     .onlyOneGroup("gr")
diff --git a/lemon/arg_parser.cc b/lemon/arg_parser.cc
--- a/lemon/arg_parser.cc
+++ b/lemon/arg_parser.cc
@@ -194,7 +194,6 @@
   {
     Opts::iterator i = _opts.find(opt);
     LEMON_ASSERT(i!=_opts.end(), "Unknown option: '"+opt+"'");
-    if(i==_opts.end()) std::cout << "JAJJJJJJJJ\n";
     LEMON_ASSERT(!(i->second.ingroup), 
                  "Option already in option group: '"+opt+"'");
     GroupData &g=_groups[group];