diff --git a/api/api_v1/endpoints/query.py b/api/api_v1/endpoints/query.py
index 8e72a2a..bea3ba5 100644
--- a/api/api_v1/endpoints/query.py
+++ b/api/api_v1/endpoints/query.py
@@ -72,6 +72,7 @@ async def event_model(
         date_range = item['date_range']
         q['date_range'] = date_range
         df = await ckdb.query_dataframe(sql)
+        df.fillna(0,inplace=True)
         if df.shape[0] == 0:
             return schemas.Msg(code=0, msg='ok', data=[q])