diff --git a/src/color-thief.js b/src/color-thief.js
index d93b2e3..4d91abb 100644
--- a/src/color-thief.js
+++ b/src/color-thief.js
@@ -128,7 +128,7 @@ ColorThief.prototype.getPalette = function(sourceImage, colorCount, quality) {
     // Send array to quantize function which clusters values
     // using median cut algorithm
     var cmap    = MMCQ.quantize(pixelArray, colorCount);
-    var palette = cmap.palette();
+    var palette = cmap? cmap.palette() : null;
 
     // Clean up
     image.removeCanvas();