Merge remote-tracking branch 'origin/MAGETWO-96440' into 2.3-develop-pr39

Author: zakdma

app/code/Magento/CatalogImportExport/Model/Export/Product.php

@@ -1158,7 +1158,7 @@ protected function collectMultiselectValues($item, $attrCode, $storeId)
     }
 
     /**
-     * Check attribute is valid
+     * Check attribute is valid.
      *
      * @param string $code
      * @param mixed $value
@@ -1175,6 +1175,10 @@ protected function isValidAttributeValue($code, $value)
             $isValid = false;
         }
 
+        if (is_array($value)) {
+            $isValid = false;
+        }
+
         return $isValid;
     }