Stock table missing SKUs

In our site, we have a lot of "Adjusted" SKUs (for various sizes and other attributes). The Stock view (node/nn/edit/stock) sometimes misses a SKU or two. I've tracked it down to this line in uc_product.module (aroudn line 1585)

models[$node->model] = $node->model;

I'm not much of a PHP programmer, but this seems broken to me. Instead, doing something like

$models[] = $node->model;

(i.e. append the base SKU).

seems to solve the problem.