Ticket #34954: 34954.patch

wp-includes/comment.php

@@ -1904 +1904 @@
         }
 
         // Make sure that the comment post ID is valid (if specified).
-        if ( isset( $commentarr['comment_post_ID'] ) && ! get_post( $commentarr['comment_post_ID'] ) ) {
+        if ( ! empty( $commentarr['comment_post_ID'] ) && ! get_post( $commentarr['comment_post_ID'] ) ) {
                 return 0;
         }