diff --git a/trytond/trytond/commandline.py b/trytond/trytond/commandline.py
index a7b0de783b..944101e712 100644
--- a/trytond/trytond/commandline.py
+++ b/trytond/trytond/commandline.py
@@ -104,7 +104,11 @@ def get_parser_cron():
 
 
 def get_parser_admin():
-    from trytond.tools.email_ import validate_email
+    from trytond.tools.email_ import validate_email as _validate_email
+
+    def validate_email(value):
+        if value:
+            return _validate_email(value)
     parser = get_parser()
 
     parser.add_argument(