diff --git a/core/modules/dblog/src/Controller/DbLogController.php b/core/modules/dblog/src/Controller/DbLogController.php
index 54bc7ea..250969f 100644
--- a/core/modules/dblog/src/Controller/DbLogController.php
+++ b/core/modules/dblog/src/Controller/DbLogController.php
@@ -362,6 +362,10 @@ public function formatMessage($row) {
       }
       // Message to translate with injected variables.
       else {
+        // Ensure backtrace strings are properly formatted.
+        if ($row->message == '%type: @message in %function (line %line of %file) @backtrace_string.') {
+          $row->message = '%type: @message in %function (line %line of %file). <pre class="backtrace">@backtrace_string</pre>';
+        }
         $message = $this->t(Xss::filterAdmin($row->message), $variables);
       }
     }
diff --git a/core/modules/dblog/tests/src/Functional/DbLogTest.php b/core/modules/dblog/tests/src/Functional/DbLogTest.php
index 7e8c3be..7f9c297 100644
--- a/core/modules/dblog/tests/src/Functional/DbLogTest.php
+++ b/core/modules/dblog/tests/src/Functional/DbLogTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\dblog\Functional;
 
+use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Component\Utility\Html;
 use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Database\Database;
@@ -24,7 +25,14 @@ class DbLogTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['dblog', 'node', 'forum', 'help', 'block'];
+  public static $modules = [
+    'dblog',
+    'error_test',
+    'node',
+    'forum',
+    'help',
+    'block',
+  ];
 
   /**
    * A user with some relevant administrative permissions.
@@ -786,4 +794,28 @@ public function testSameTimestampEntries() {
     $this->assertEquals($entries[2]['message'], 'First Entry #0');
   }
 
+  /**
+   * Tests that the details page displays correctly backtrace.
+   */
+  public function testBacktrace() {
+    $this->drupalLogin($this->adminUser);
+    $this->drupalGet('/error-test/generate-warnings');
+
+    $wid = Database::getConnection()->query('SELECT MAX(wid) FROM {watchdog}')->fetchField();
+    $this->drupalGet('admin/reports/dblog/event/' . $wid);
+
+    $error_user_notice = [
+      '%type' => 'User warning',
+      '@message' => 'Drupal & awesome',
+      '%function' => 'Drupal\error_test\Controller\ErrorTestController->generateWarnings()',
+      '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
+    ];
+
+    // Check if the full message displays on the details page and backtrace is a
+    // pre-formatted text.
+    $message = new FormattableMarkup('%type: @message in %function (line', $error_user_notice);
+    $this->assertRaw($message);
+    $this->assertRaw('<pre class="backtrace">');
+  }
+
 }