I am having a issue when a subscription item and non subscription items are sent to pay at paypal checkout

If “Add separately” is checked it works fine.

If “Add separately” is not checked then it throws an error when trying to submit to paypal.

with 1 subscription and 2 non subscription items in cart.

2020-03-18T07:11:50+00:00 CRITICAL Uncaught Error: Call to a member function get_stock_managed_by_id() on null in D:homesitewwwrootwp-contentpluginswoocommerceincludesclass-wc-cart.php:696
Stack trace:
#0 D:homesitewwwrootwp-contentpluginswoocommerceincludesclass-wc-cart.php(1072): WC_Cart->get_cart_item_quantities()
#1 D:homesitewwwrootwp-contentpluginswpc-force-sellswpc-force-sells.php(970): WC_Cart->add_to_cart(297, 1, 0, Array, Array)
#2 D:homesitewwwrootwp-includesclass-wp-hook.php(288): WPClever_Woofs->woofs_add_to_cart(‘eaeb346f8c27097…’, 242, 1, 0, Array, Array)
#3 D:homesitewwwrootwp-includesclass-wp-hook.php(312): WP_Hook->apply_filters(”, Array)
#4 D:homesitewwwrootwp-includesplugin.php(478): WP_Hook->do_action(Array)
#5 D:homesitewwwrootwp-contentpluginswoocommerceincludesclass-wc-cart.php(1115): do_action(‘woocommerce_add…’, ‘eaeb346f8c27097…’, 242, 1, 0, Array, Array)
#6 D:homesitewwwrootwp-contentpluginsyith-woocommerce-subscriptionincludesclass.yith-wc-subscription-or in D:homesitewwwrootwp-contentpluginswoocommerceincludesclass-wc-cart.php on line 696

I did some debugging and the issue is that it looks like woofs is adding a extra  "woofs_keys" to the cart items when it goes to checkout to paypal.  

So when $this->get_cart()  and the cart loops through the array it finds "woofs_keys" and triess to get the product from it.
$product = $values['data'];  <--- but $values['data'] is null since there is not 'data' item in "woofs_keys"

I worked around it but adding a check to all the following likes below
if (array_key_exists("data",$cart_item))

lines #'s:

wp-content/plugins/woocommerce/include/class-wc-cart.php  696,678,755,781,1387
wp-content/plugins/woocommerce/include/class-wc-cart-totals.php  221
wp-content\plugins\woocommerce\includes\class-wc-discounts.php on line 83
wp-content\plugins\woocommerce\includes\class-wc-cart.php on line 1310
wp-content\plugins\woocommerce-services\classes\class-wc-connect-taxjar-integration.php on line 361,571

The root issue is to remove the "woofs_keys" from the cart items as its things its a line item when it send it to paypal for checkout.