diff --git a/api/api_v1/endpoints/query.py b/api/api_v1/endpoints/query.py
index 57eb255..e8590ab 100644
--- a/api/api_v1/endpoints/query.py
+++ b/api/api_v1/endpoints/query.py
@@ -91,7 +91,7 @@ async def event_model(
             for i in set(date_range) - set(df['date']):
                 concat_data.append((i, 0))
             df = pd.concat([df, pd.DataFrame(concat_data, columns=df.columns)])
-            df.sort_values('values', inplace=True)
+            df.sort_values('date', inplace=True)
             q['values'].append(df['values'].to_list())
         q['date_range'] = [d.strftime('%Y-%m-%d %H:%M:%S') for d in q['date_range']]
         res.append(q)