diff --git a/app/views/scolar.py b/app/views/scolar.py
index ab113a00..c45af3fe 100644
--- a/app/views/scolar.py
+++ b/app/views/scolar.py
@@ -1367,7 +1367,9 @@ def etudident_edit_form():
 
 
 def _validate_date_naissance(val: str, field) -> bool:
-    "vrai si date saisie valide"
+    "vrai si date saisie valide (peut être vide)"
+    if not val:
+        return True
     try:
         date_naissance = scu.convert_fr_date(val)
     except ScoValueError:
@@ -1788,7 +1790,11 @@ def _etudident_create_or_edit_form(edit):
                 + homonyms_html
                 + F
             )
-        tf[2]["date_naissance"] = scu.convert_fr_date(tf[2]["date_naissance"])
+        tf[2]["date_naissance"] = (
+            scu.convert_fr_date(tf[2]["date_naissance"])
+            if tf[2]["date_naissance"]
+            else None
+        )
         if not edit:
             etud = sco_etud.create_etud(cnx, args=tf[2])
             etudid = etud["etudid"]
diff --git a/sco_version.py b/sco_version.py
index 16ddaebd..67362a1a 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.6.965"
+SCOVERSION = "9.6.966"
 
 SCONAME = "ScoDoc"