diff --git a/vendor/magento/module-staging/Controller/Adminhtml/Update/Save.php b/vendor/magento/module-staging/Controller/Adminhtml/Update/Save.php
index b18f125dcdb..a9b4404dad3 100644
--- a/vendor/magento/module-staging/Controller/Adminhtml/Update/Save.php
+++ b/vendor/magento/module-staging/Controller/Adminhtml/Update/Save.php
@@ -9,6 +9,7 @@
 use Magento\Framework\App\Action\HttpPostActionInterface;
 use Magento\Framework\App\ObjectManager;
 use Magento\Framework\Escaper;
+use Magento\Framework\Exception\LocalizedException;
 use Magento\Staging\Api\Data\UpdateInterface;
 use Magento\Staging\Model\ResourceModel\Db\CampaignValidator;

@@ -22,7 +23,7 @@ class Save extends \Magento\Backend\App\Action implements HttpPostActionInterfac
      *
      * @see _isAllowed()
      */
-    const ADMIN_RESOURCE = 'Magento_Staging::staging';
+    public const ADMIN_RESOURCE = 'Magento_Staging::staging';

     /**
      * @var \Magento\Staging\Api\UpdateRepositoryInterface
@@ -88,15 +89,12 @@ public function execute()
                 /** @var UpdateInterface $update */
                 $update = $this->updateRepository->get($updateData['id']);

-                if (strtotime($update->getStartTime()) < time()
-                    && strtotime($updateData['start_time']) !== strtotime($update->getStartTime())
+                if (strtotime($updateData['start_time']) !== strtotime($update->getStartTime())
+                    && strtotime($updateData['start_time']) < time()
                 ) {
-                    $this->messageManager->addErrorMessage(
-                        __(
-                            "The Start Time of this Update cannot be changed. It's been already started."
-                        )
+                    throw new LocalizedException(
+                        __("The Future Update Start Time is invalid. It can't be earlier than the current time.")
                     );
-                    return $this->resultRedirectFactory->create()->setPath('*/*/');
                 }

                 if (!$this->campaignValidator->canBeUpdated($update, strtotime($updateData['end_time']))) {
@@ -114,9 +112,9 @@ public function execute()
                 sprintf('You saved the "%s" update.', $this->escaper->escapeHtml($update->getName()))
             );
         } catch (\Exception $e) {
-            $this->messageManager->addError(__("Cannot save Update."));
+            $this->messageManager->addExceptionMessage($e);

-            if (isset($update) && $update->getId()) {
+            if ($update !== null && $update->getId()) {
                 return $this->resultRedirectFactory->create()->setPath('*/*/edit', ['id' => $update->getId()]);
             }