Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 4493)
+++ /CKEditor/trunk/CHANGES.html	(revision 4494)
@@ -61,4 +61,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/4514">#4514</a> : Fixed press 'Back' button breaks wysiwyg editing mode.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/4542">#4542</a> : Fixed unable to access buttons using tab key in Safari and Opera.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/4577">#4577</a> : Fixed relative link url is broken after opening 'Link' dialog.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/link/dialogs/link.js
===================================================================
--- /CKEditor/trunk/_source/plugins/link/dialogs/link.js	(revision 4493)
+++ /CKEditor/trunk/_source/plugins/link/dialogs/link.js	(revision 4494)
@@ -306,5 +306,5 @@
 										{
 											if ( data.url )
-												this.setValue( data.url.protocol );
+												this.setValue( data.url.protocol || '' );
 										},
 										commit : function( data )