After deleting the node with reference, the backreference value is not deleted

First, thank you for this module, which is simple (a big advantage in comparison to similar modules) and very useful.

I have only this problem: if I delete one node which is already in 1-1 relationship, the corresponding backreference value is not deleted (the [nid] remains there). It causes problems by displaying results.

Explanation in detail and exmaple: I use Backreference for displaying images. I have image node with single imagefield and nodereference field to the story content type (wchich has backreference field). In the story content type I use backreference field for displaying results (via tpl.php and custom code). If I delete any image, the backreference value (nid) remains in the story content type and, as a result, the formatted div with missing image (because it is already deleted) is displayed to the user.

Thank you in advance for help.