MAGETWO-95652: Call to \Magento\Framework\Api\MetadataServiceInterface::getCustomAttributesMetadata leads to fatal error

Author: duhon

app/code/Magento/Catalog/Model/FilterProductCustomAttribute.php

@@ -28,7 +28,7 @@ public function __construct(array $blackList = [])
     /**
      * Delete custom attribute
      *
-     * @param array $attributes
+     * @param array $attributes set objects attributes @example ['attribute_code'=>'attribute_object']
      * @return array
      */
     public function execute(array $attributes): array

app/code/Magento/Catalog/Model/Product.php

@@ -506,13 +506,16 @@ protected function _getResource()
     protected function getCustomAttributesCodes()
     {
         if ($this->customAttributesCodes === null) {
-            $this->customAttributesCodes = array_keys($this->eavConfig->getEntityAttributes(
-                self::ENTITY,
-                $this
-            ));
-
-            $this->customAttributesCodes = $this->filterCustomAttribute->execute($this->customAttributesCodes);
-            $this->customAttributesCodes = array_diff($this->customAttributesCodes, ProductInterface::ATTRIBUTES);
+            $this->customAttributesCodes = array_diff(
+                array_keys(
+                    $this->filterCustomAttribute->execute(
+                        $this->eavConfig->getEntityAttributes(
+                            self::ENTITY,
+                            $this
+                        )
+                    )
+                ), ProductInterface::ATTRIBUTES
+            );
         }
 
         return $this->customAttributesCodes;