Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 18734)
+++ wp-includes/formatting.php	(working copy)
@@ -1859,6 +1859,8 @@
 	if ( '' == $text ) {
 		$text = get_the_content('');
 
+		$text = wp_strip_all_tags( $text );
+
 		$text = strip_shortcodes( $text );
 
 		$text = apply_filters('the_content', $text);