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chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview Classes related to cursors that point to and select parts of
  * the automation tree.
  */
 
 goog.provide('cursors.Cursor');
@@ skipping 516 matching lines @@
             focusOffset: this.end.selectionIndex_ }
       );
     }
   },
 
   /**
    * Returns true if this range has either cursor end on web content.
    * @return {boolean}
   */
   isWebRange: function() {
-    return this.start.node.root.role != RoleType.desktop ||
-        this.end.node.root.role != RoleType.desktop;
+    return this.isValid() &&
+        (this.start.node.root.role != RoleType.desktop ||
+        this.end.node.root.role != RoleType.desktop);
   },
 
   /**
    * Returns whether this range has valid start and end cursors.
    * @return {boolean}
    */
   isValid: function() {
     return this.start.isValid() && this.end.isValid();
   }
 };
 
 });  // goog.scope