diff --git a/js/model/Frame.js b/js/model/Frame.js
index 04790344..bef3e94c 100644
--- a/js/model/Frame.js
+++ b/js/model/Frame.js
@@ -48,7 +48,7 @@
 	ns.Frame.prototype.clonePixels_ = function (pixels) {
 		var clonedPixels = [];
 		for (var col = 0 ; col < pixels.length ; col++) {
-			clonedPixels[col] = pixels[col].slice(0 , this.getHeight());
+			clonedPixels[col] = pixels[col].slice(0 , pixels[col].length-1);
 		}
 		return clonedPixels;
 	};