diff --git a/src/Bundle/ChillActivityBundle/Export/Export/ListActivityHelper.php b/src/Bundle/ChillActivityBundle/Export/Export/ListActivityHelper.php
index 75d2c3fd0..15137b013 100644
--- a/src/Bundle/ChillActivityBundle/Export/Export/ListActivityHelper.php
+++ b/src/Bundle/ChillActivityBundle/Export/Export/ListActivityHelper.php
@@ -152,7 +152,7 @@ class ListActivityHelper
                     return '';
                 }
 
-                return $this->translator->trans($value);
+                return $this->translator->trans((string) $value);
             },
         };
     }