diff --git a/core/modules/system/src/Tests/Update/SiteLogoAltTitleAddedTest.php b/core/modules/system/src/Tests/Update/SiteLogoAltTitleAddedTest.php
index fcd702b..c49db34 100644
--- a/core/modules/system/src/Tests/Update/SiteLogoAltTitleAddedTest.php
+++ b/core/modules/system/src/Tests/Update/SiteLogoAltTitleAddedTest.php
@@ -48,10 +48,13 @@ public function testSiteLogoAltTitleAdded() {
     $this->assertEqual($this->config('system.theme.global')->get('logo.alt'), 'Home');
     $this->assertEqual($this->config('system.theme.global')->get('logo.title'), 'Home');
 
-    // Check that each enabled theme has the exepected valuesafter the update.
+    // Check that each enabled theme has the expected values after the update.
     foreach ($this->themeHandler->listInfo() as $theme) {
-      $this->assertEqual($this->config($theme->getName() . '.settings')->get('logo.alt'), 'Home');
-      $this->assertEqual($this->config($theme->getName() . '.settings')->get('logo.title'), 'Home');
+      $theme_settings = $this->config($theme->getName() . '.settings');
+      if (!$theme_settings->isNew()) {
+        $this->assertEqual($theme_settings->get('logo.alt'), 'Home');
+        $this->assertEqual($theme_settings->get('logo.title'), 'Home');
+      }
     }
   }