diff --git a/src/HighGUI.cc b/src/HighGUI.cc
index 217917a..9c057fd 100644
--- a/src/HighGUI.cc
+++ b/src/HighGUI.cc
@@ -74,10 +74,12 @@ NamedWindow::BlockingWaitKey(const v8::Arguments& args){
 	//SETUP_FUNCTION(NamedWindow)
 	int time = 0;
 
-  if (args.Length() > 0){
+  if (args.Length() > 1){
     time = args[1]->IntegerValue();
   }else{
-    time = args[0]->IntegerValue();
+    if (args.Length() > 0){
+      time = args[0]->IntegerValue();
+    }
   }
 
   int res = cv::waitKey(time);