diff --git a/core/modules/dblog/lib/Drupal/dblog/Plugin/views/field/DblogMessage.php b/core/modules/dblog/lib/Drupal/dblog/Plugin/views/field/DblogMessage.php
index 15fd715..ecfa406 100644
--- a/core/modules/dblog/lib/Drupal/dblog/Plugin/views/field/DblogMessage.php
+++ b/core/modules/dblog/lib/Drupal/dblog/Plugin/views/field/DblogMessage.php
@@ -67,7 +67,7 @@ function render($values) {
 
     if ($this->options['replace_variables']) {
       $variables = unserialize($this->get_value($values, 'variables'));
-      return format_string($value, $variables ? $variables : array());
+      return format_string($value, (array) $variables);
     }
     else {
       return $this->sanitizeValue($value);