AeroCommerce / API Routes

When running artisan optimize the below error is returned: Unable to prepare route [api/products/{productId}/variants] for serialization. Another route has already been assigned name [api.variants.store]. This appears to be due to routes/api.php line 49 having the name api.variants.store [http://api.variants.store] and line 54 also having the same name. Also the name api.variants.update is used on line 50 and then again on line 55.