Index: /FCKeditor/trunk/editor/_source/internals/fckundo.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fckundo.js	(revision 633)
+++ /FCKeditor/trunk/editor/_source/internals/fckundo.js	(revision 634)
@@ -32,5 +32,13 @@
 {
 	var range = new FCKDomRange( FCK.EditorWindow ) ;
-	range.MoveToSelection() ;
+	try
+	{
+		// There are some tricky cases where this might fail (e.g. having a lone empty table in IE)
+		range.MoveToSelection() ;
+	}
+	catch ( e )
+	{
+		return null ;
+	}
 	if ( FCKBrowserInfo.IsIE )
 	{