diff --git a/handler/lib/serde/nordigen.py b/handler/lib/serde/nordigen.py
index 13b4617..327548c 100644
--- a/handler/lib/serde/nordigen.py
+++ b/handler/lib/serde/nordigen.py
@@ -49,7 +49,7 @@ class Transactions(Model):
 
 
 class TXRoot(Model):
-    transactions: fields.Nested(Transactions)
+    transactions: fields.Optional(fields.Nested(Transactions))
 
 
 class AccessToken(Model):