Index: /CKEditor/trunk/_source/plugins/enterkey/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/enterkey/plugin.js	(revision 5464)
+++ /CKEditor/trunk/_source/plugins/enterkey/plugin.js	(revision 5465)
@@ -33,5 +33,5 @@
 						block = path.block;
 
-				if ( block.is( 'li' ) || block.getParent().is( 'li' ) )
+				if ( block && ( block.is( 'li' ) || block.getParent().is( 'li' ) ) )
 				{
 					editor.execCommand( 'outdent' );