diff --git a/www/web/warppay/models.py b/www/web/warppay/models.py
index aad290f480671faa5609a76df18ab38b901b9af1..8c13af91e5cf9607dc5e8ec9f5a5c23e3f292655 100644
--- a/www/web/warppay/models.py
+++ b/www/web/warppay/models.py
@@ -56,7 +56,7 @@ class UserCredit(models.Model):
     uid = models.CharField(max_length=100,unique=True)
     card_id = models.CharField(max_length=10, null=True) # Unique only with django 1.11
     credit = models.FloatField()
-    pinCode = models.CharField(max_length=100)
+    pinCode = models.CharField(max_length=100, null=True)
 
     def __str__(self):
         return self.uid