From a66d274169540553c022b9f204a77b4589968db5 Mon Sep 17 00:00:00 2001
From: Neil Fraser <fraser@google.com>
Date: Mon, 21 Nov 2016 01:18:28 -0800
Subject: [PATCH] Fix broken highlighting when highlighted block is deleted. 
 Issue 752.

---
 core/block_svg.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/block_svg.js b/core/block_svg.js
index e94f5bd43..4133b6fdc 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -1514,6 +1514,9 @@ Blockly.BlockSvg.prototype.setDisabled = function(disabled) {
  * @param {boolean} highlighted True if highlighted.
  */
 Blockly.BlockSvg.prototype.setHighlighted = function(highlighted) {
+  if (!this.rendered) {
+    return;
+  }
   if (highlighted) {
     this.svgPath_.setAttribute('filter',
         'url(#' + this.workspace.options.embossFilterId + ')');