diff --git a/handlers/views_handler_field_serialized.inc b/handlers/views_handler_field_serialized.inc
index 1579fce..0000cee 100644
--- a/handlers/views_handler_field_serialized.inc
+++ b/handlers/views_handler_field_serialized.inc
@@ -56,8 +56,10 @@ class views_handler_field_serialized extends views_handler_field {
       return check_plain(print_r(unserialize($value), TRUE));
     }
     elseif ($this->options['format'] == 'key' && !empty($this->options['key'])) {
-      $value = (array) unserialize($value);
-      return check_plain($value[$this->options['key']]);
+      $array = (array) unserialize($value);
+      if (isset($array[$this->options['key']])) {
+        return check_plain($array[$this->options['key']]);
+      }
     }
 
     return $value;