Index: /CKEditor/trunk/_source/plugins/htmldataprocessor/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/htmldataprocessor/plugin.js	(revision 7417)
+++ /CKEditor/trunk/_source/plugins/htmldataprocessor/plugin.js	(revision 7418)
@@ -523,5 +523,5 @@
 
 			// Restore shortly protected attribute names. 
-			data = data.replace( new RegExp( ' data-cke-' + CKEDITOR.rnd + '-', 'ig' ), '' ); 
+			data = data.replace( new RegExp( ' data-cke-' + CKEDITOR.rnd + '-', 'ig' ), ' ' );
 
 			// Unprotect "some" of the protected elements at this point.