Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5274)
+++ /CKEditor/trunk/CHANGES.html	(revision 5275)
@@ -90,4 +90,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/5170">#5170</a> : Firefox does not insert  text into element properly.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/4026">#4026</a> : Office2003 skin has no toolbar button borders in High Contrast in IE7.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/4348">#4348</a> : There should have exception thrown when 'CKEDITOR_BASEPATH' could be figured out automatically.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/core/ckeditor_base.js
===================================================================
--- /CKEditor/trunk/_source/core/ckeditor_base.js	(revision 5274)
+++ /CKEditor/trunk/_source/core/ckeditor_base.js	(revision 5275)
@@ -1,3 +1,3 @@
-/*
+/*
 Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.html or http://ckeditor.com/license
@@ -137,4 +137,7 @@
 				}
 
+				if( !path )
+						throw 'The CKEditor installation path could not be automatically detected. Please set the global variable "CKEDITOR_BASEPATH" before creating editor instances.'
+
 				return path;
 			})(),