diff --git a/freetype/raster/paint.go b/freetype/raster/paint.go
index f2f093b..ff1943c 100644
--- a/freetype/raster/paint.go
+++ b/freetype/raster/paint.go
@@ -105,6 +105,9 @@ func (r *RGBAPainter) Paint(ss []Span, done bool) {
 		if s.X1 > b.Max.X {
 			s.X1 = b.Max.X
 		}
+		if s.X0 >= s.X1 {
+			continue
+		}
 		base := s.Y * r.Image.Stride
 		p := r.Image.Pix[base+s.X0 : base+s.X1]
 		for i, rgba := range p {