diff --git a/sbc_translation/models/translation_user.py b/sbc_translation/models/translation_user.py
index abf716b11..d09b9539c 100644
--- a/sbc_translation/models/translation_user.py
+++ b/sbc_translation/models/translation_user.py
@@ -58,7 +58,8 @@ def _compute_nb_translated_letters_this_year(self):
         for translator in self:
             translator.nb_translated_letters_this_year = len(
                 translator.translated_letter_ids.filtered(
-                    lambda it: it.translate_date.year == fields.Datetime.now().year
+                    lambda it: it.translate_date and
+                    it.translate_date.year == fields.Datetime.now().year
                 )
             )