diff --git a/gapps/cardservice/models.py b/gapps/cardservice/models.py
index 75119bf..4cde5ef 100644
--- a/gapps/cardservice/models.py
+++ b/gapps/cardservice/models.py
@@ -5,8 +5,8 @@
 
 
 class TimeZone(BaseModel):
-    id: str
-    offset: int
+    id: str = None
+    offset: int = None
 
 
 class CommonEvent(BaseModel):