Fix PNG export when brower extensions inject CSS (#2379)

Change-Id: I305dca87f36e6d6659a3586cb9b3b014bbcafa89

Fix PNG export when brower extensions inject CSS (#2379)
Change-Id: I305dca87f36e6d6659a3586cb9b3b014bbcafa89
c0832c3f · Evan W. Patton · GitHub · a6d66e17 · c0832c3f
Unverified Commit c0832c3f authored Jan 20, 2021 by Evan W. Patton Committed by GitHub Jan 20, 2021
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appinventor/blocklyeditor/src/exportBlocksImage.js appinventor/blocklyeditor/src/exportBlocksImage.js +7 -1

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--- a/appinventor/blocklyeditor/src/exportBlocksImage.js
+++ b/appinventor/blocklyeditor/src/exportBlocksImage.js
@@ -38,7 +38,13 @@ goog.require('goog.Timer');
        console.warn("Cannot include styles from other hosts: "+sheets[i].href);
        continue;
      }
-      var rules = sheets[i].cssRules;
+      var rules = null;
+      try {
+        rules = sheets[i].cssRules;
+      } catch (e) {
+        console.warn('Skipping a potentially injected stylesheet', e);
+        continue;
+      }
      if (rules != null) {
        for (var j = 0; j < rules.length; j++) {
          var rule = rules[j];