Index: /FCKeditor/trunk/editor/_source/internals/fckstyles.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fckstyles.js	(revision 1048)
+++ /FCKeditor/trunk/editor/_source/internals/fckstyles.js	(revision 1049)
@@ -291,4 +291,8 @@
 		// Get the "Style" nodes defined in the XML file.
 		var styleNodes = stylesXmlObj.$Style ;
+
+		// Check that it did contain some valid nodes
+		if ( !styleNodes )
+			return styles ;
 
 		// Add each style to our "Styles" collection.