diff --git a/ansi/sixel/color.go b/ansi/sixel/color.go
index 07bbdab5..2f00ce25 100644
--- a/ansi/sixel/color.go
+++ b/ansi/sixel/color.go
@@ -32,6 +32,10 @@ func ConvertChannel(c uint32) uint32 {
 // FromColor returns a Sixel color from a color.Color. It converts the color
 // channels to the 0-100 range.
 func FromColor(c color.Color) Color {
+	if c == nil {
+		return Color{}
+	}
+
 	r, g, b, _ := c.RGBA()
 	return Color{
 		Pu: 2, // Always use RGB format "2"