diff --git a/core/lib/schemas/nordigen_s.py b/core/lib/schemas/nordigen_s.py
index a32eb67..e5e7147 100644
--- a/core/lib/schemas/nordigen_s.py
+++ b/core/lib/schemas/nordigen_s.py
@@ -133,8 +133,8 @@ AccountDetailsSchema = {
 
 class AccountBalance(BaseModel):
     balanceAmount: dict[str, str]
-    balanceType: str
-    referenceDate: str
+    balanceType: str | None
+    referenceDate: str | None
 
 
 class AccountBalances(BaseModel):