Index: /FCKeditor/trunk/_whatsnew.html
===================================================================
--- /FCKeditor/trunk/_whatsnew.html	(revision 3549)
+++ /FCKeditor/trunk/_whatsnew.html	(revision 3550)
@@ -51,4 +51,6 @@
 		<li>[<a target="_blank" href="http://dev.fckeditor.net/ticket/2821">#2821</a>] Configuration
 			items that used floating point numbers were parsed as integers.</li>
+		<li>[<a target="_blank" href="http://dev.fckeditor.net/ticket/3429">#3429</a>] Fixed
+			problem in IE8 with XHTML doctype. Thanks to duncansimey.</li>
 		<li>Language file updates for the following languages:
 			<ul>
Index: /FCKeditor/trunk/editor/_source/internals/fck_ie.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fck_ie.js	(revision 3549)
+++ /FCKeditor/trunk/editor/_source/internals/fck_ie.js	(revision 3550)
@@ -449,5 +449,5 @@
 	// in editable mode. Otherwise the whole browser window may be locked by
 	// the buttons. (#1782)
-	if ( e.nodeName.IEquals( 'input' ) && e.type.IEquals( ['radio', 'checkbox'] ) && !e.disabled )
+	if ( e.nodeName && e.nodeName.IEquals( 'input' ) && e.type.IEquals( ['radio', 'checkbox'] ) && !e.disabled )
 	{
 		e.disabled = true ;