Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 3938)
+++ /CKEditor/trunk/CHANGES.html	(revision 3939)
@@ -154,5 +154,8 @@
 		<li><a href="http://dev.fckeditor.net/ticket/3783">#3783</a> : Fixed indenting command in table cells create collapsed paragraph.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/3968">#3968</a> : About dialog layout was broken with IE+Standards+RTL.</li>
-		<li><a href="http://dev.fckeditor.net/ticket/3991">#3991</a> : In IE quirks, text was not visible in v2 and office2003 skins.</li>		
+		<li><a href="http://dev.fckeditor.net/ticket/3991">#3991</a> : In IE quirks, text was not visible in v2 and office2003 skins.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/3983">#3983</a> : In IE, we&#39;ll now 
+			silently ignore wrong toolbar definition settings which have extra commas being 
+			left around.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/toolbar/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/toolbar/plugin.js	(revision 3938)
+++ /CKEditor/trunk/_source/plugins/toolbar/plugin.js	(revision 3939)
@@ -128,6 +128,15 @@
 						for ( var r = 0 ; r < toolbar.length ; r++ )
 						{
-							var row = toolbar[ r ],
-								toolbarId = 'cke_' + CKEDITOR.tools.getNextNumber(),
+							var row = toolbar[ r ];
+
+							// It's better to check if the row object is really
+							// available because it's a common mistake to leave
+							// an extra comma in the toolbar definition
+							// settings, which leads on the editor not loading
+							// at all in IE. (#3983)
+							if ( !row )
+								continue;
+
+							var toolbarId = 'cke_' + CKEDITOR.tools.getNextNumber(),
 								toolbarObj = { id : toolbarId, items : [] };