Blank screen after updating subscription CC with a declined card

[Genevieve-K]

I make a subscription with Stripe, then I update Payment Info. I choose a Stripe card declined , and the result is a blank screen.
Explanation: the update function returns an error with the function give_send_back_to_checkout, and in this function, $_POST['give-current-url'] is not defined.
Could you add it in shortcode-subscription-update.php?
In the meantime, I fixed by filter give_recurring_before_update and add this:
<input type="hidden" name="give-current-url" value="<?php echo get_permalink() ?>">