Notice: Undefined offset: 0 in includes/variations.php

After doing the updates on my site, I started getting an error from the code trying to get the first element of an empty array. I fixed it manually. Here’s the fix, if anyone else wants it:

In includes/variations.php, line 170, replace :
$_prod = wc_get_product( $attributes[0]['id'] );
by :
$_prod = ! empty( $attributes[0]['id'] ) ? wc_get_product( $attributes[0]['id'] ) : null;