nil work

main.go

@@ -126,7 +126,7 @@ func NewAnimation(sz image.Point, mqMessages chan mqtt.Message) *Animation {
 	rawMario, _, err = image.Decode(reader)
 	//marioDown := imaging.FlipH(imaging.Resize(rawMario, 16, 16, imaging.Lanczos))
 	marioDown := imaging.Resize(rawMario, 16, 16, imaging.Lanczos)
-	images := []image.Image{marioUp, marioDown}
+	images := []image.Image{marioUp, marioDown, nil}
 	return &Animation{
 		ctx:       gg.NewContext(sz.X, sz.Y),
 		dir:       image.Point{1, 1},