Check return value for getProduct() in getPrice().

If getProduct() returns a NULL value then this code will generate a PHP warning and potentially crash the page; let's not do that, and check our return values before we try to call methods on them.

Author: pbaylies

app/code/Magento/ConfigurableProduct/Model/Product/Type/Configurable/Price.php

@@ -39,7 +39,7 @@ public function getFinalPrice($qty, $product)
      */
     public function getPrice($product)
     {
-        if ($product->getCustomOption('simple_product')) {
+        if ( !empty( $product ) && !empty( $product->getCustomOption('simple_product') ) && !empty( $product->getCustomOption('simple_product')->getProduct() ) ) {
             return $product->getCustomOption('simple_product')->getProduct()->getPrice();
         } else {
             return 0;