diff --git a/mozilla/extensions/irc/xul/content/handlers.js b/mozilla/extensions/irc/xul/content/handlers.js
index 0d139806526..da317eadbc9 100644
--- a/mozilla/extensions/irc/xul/content/handlers.js
+++ b/mozilla/extensions/irc/xul/content/handlers.js
@@ -310,7 +310,7 @@ function onTooltip(event)
     var XLinkTitleText = null;
 
     var element = document.tooltipNode;
-    while (element)
+    while (element && (element != document.documentElement))
     {
         if (element.nodeType == Node.ELEMENT_NODE)
         {