diff --git a/examples/gifdec.c b/examples/gifdec.c
index f921c0a4..feb84e6e 100644
--- a/examples/gifdec.c
+++ b/examples/gifdec.c
@@ -87,7 +87,8 @@ static void Remap(const GifFileType* const gif, const uint8_t* const src,
   const GifColorType* colors;
   const ColorMapObject* const cmap =
       gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
-  if (cmap == NULL) return;
+  if (cmap == NULL || cmap->Colors == NULL) return;
+  if (len > cmap->ColorCount) len = cmap->ColorCount;
   colors = cmap->Colors;
 
   for (i = 0; i < len; ++i) {