Index: admin-ajax.php
===================================================================
--- admin-ajax.php	(revision 12374)
+++ admin-ajax.php	(working copy)
@@ -710,6 +710,8 @@
 		die('1');
 	elseif ( in_array($status, array('draft', 'pending') ) )
 		die( __('Error: you are replying to a comment on a draft post.') );
+	elseif ( in_array($status, array('trash') ) )
+		die( __('Error: you are replying to a comment on a trashed post.') );
 
 	$user = wp_get_current_user();
 	if ( $user->ID ) {