diff --git a/src/robotjs.cc b/src/robotjs.cc
index b34a45b8..51b24fa3 100644
--- a/src/robotjs.cc
+++ b/src/robotjs.cc
@@ -610,6 +610,11 @@ NAN_METHOD(setKeyboardDelay)
 
 NAN_METHOD(getPixelColor)
 {
+	if (info.Length() != 2)
+	{
+		return Nan::ThrowError("Invalid number of arguments.");
+	}
+	
 	MMBitmapRef bitmap;
 	MMRGBHex color;