From 9aff2a9aafea39288564699e38e1715029342f28 Mon Sep 17 00:00:00 2001
From: Ravi Chandra <ravi.chandra@krishtechnolabs.com>
Date: Wed, 24 Apr 2019 10:30:55 +0530
Subject: [PATCH] Fixed Changing sample for downloadable product failure

---
 app/code/Magento/Downloadable/Model/SampleRepository.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/app/code/Magento/Downloadable/Model/SampleRepository.php b/app/code/Magento/Downloadable/Model/SampleRepository.php
index 5b9e8e784b9f3..00f653e87b5ae 100644
--- a/app/code/Magento/Downloadable/Model/SampleRepository.php
+++ b/app/code/Magento/Downloadable/Model/SampleRepository.php
@@ -299,8 +299,11 @@ protected function updateSample(
             $existingSample->setTitle($sample->getTitle());
         }
 
-        if ($sample->getSampleType() === 'file' && $sample->getSampleFileContent() === null) {
-            $sample->setSampleFile($existingSample->getSampleFile());
+        if ($sample->getSampleType() === 'file'
+            && $sample->getSampleFileContent() === null
+            && $sample->getSampleFile() !== null
+        ) {
+            $existingSample->setSampleFile($sample->getSampleFile());
         }
         $this->saveSample($product, $sample, $isGlobalScopeContent);
         return $existingSample->getId();