diff --git a/browser/components/places/content/treeView.js b/browser/components/places/content/treeView.js
index 5baf3a21f8..181bb5404a 100644
--- a/browser/components/places/content/treeView.js
+++ b/browser/components/places/content/treeView.js
@@ -170,7 +170,9 @@ PlacesTreeView.prototype = {
     let row = -1;
     let useNodeIndex = typeof(aNodeIndex) == "number";
     if (parent == this._rootNode) {
-      row = useNodeIndex ? aNodeIndex : this._rootNode.getChildIndex(aNode);
+      if (aNode instanceof Ci.nsINavHistoryResultNode) { 
+        row = useNodeIndex ? aNodeIndex : this._rootNode.getChildIndex(aNode); 
+      }
     }
     else if (useNodeIndex && typeof(aParentRow) == "number") {
       // If we have both the row of the parent node, and the node's index, we