Index: /MediaWiki/trunk/plugins/mediawiki/fckplugin.js
===================================================================
--- /MediaWiki/trunk/plugins/mediawiki/fckplugin.js	(revision 1820)
+++ /MediaWiki/trunk/plugins/mediawiki/fckplugin.js	(revision 1821)
@@ -588,5 +588,5 @@
 					sAttValue = htmlNode.getAttribute( sAttName, 2 ) ;	// We must use getAttribute to get it exactly as it is defined.
 
-				attStr += ' ' + sAttName + '="' + sAttValue.replace( '"', '"' ) + '"' ;
+				attStr += ' ' + sAttName + '="' + String(sAttValue).replace( '"', '"' ) + '"' ;
 			}
 		}