diff --git a/modules/dblog/dblog.admin.inc b/modules/dblog/dblog.admin.inc
index f8a00c2..f77e63d 100644
--- a/modules/dblog/dblog.admin.inc
+++ b/modules/dblog/dblog.admin.inc
@@ -286,13 +286,18 @@ function theme_dblog_message($variables) {
   $event = $variables['event'];
   // Check for required properties.
   if (isset($event->message) && isset($event->variables)) {
+    $args = @unserialize($event->variables);
     // Messages without variables or user specified text.
-    if ($event->variables === 'N;') {
+    if ($args === NULL) {
       $output = $event->message;
     }
+    // Variables is not a NULL neither an array.
+    elseif (!is_array($args)) {
+      $output = t('Log data is corrupted and cannot be unserialized: @message', array('@message' => $event->message));
+    }
     // Message to translate with injected variables.
     else {
-      $output = t($event->message, unserialize($event->variables));
+      $output = t($event->message, $args);
     }
     // If the output is expected to be a link, strip all the tags and
     // special characters by using filter_xss() without any allowed tags.