M2.3.5, v1.3.2: Error when updating items in cart and emptying cart

ISSUE:

1, Updating product in cart shows "error"

"The product that was requested doesn't exist. Verify the product and try again.": https://i.imgur.com/mDieecL.png 

2, Emptying cart shows "error"

"We can't remove the item.": https://i.imgur.com/NhF4CxJ.png 

SOLUTION:

The module can't get the lastProduct and lastChildProduct from the checkoutSession event at app/code/Bss/Simpledetailconfigurable/Observer/SetAdditionalOptions.php, so getting the product by lastProduct event will cause an error. 

To temporarily resolve the issue, please edit the file: app/code/Bss/Simpledetailconfigurable/Observer/SetAdditionalOptions.php as below:

Or download the file attached below to override the current file on your site.

If you need any further assistance, please feel free to contact us. We'd be happy to support you!