Error Fixed

app.py

@@ -152,8 +152,8 @@ def build_onyx_payload(messages, model_provider, model_version, temperature, cha
         "include_citations": False
     }
     
-    # Remove None values
-    payload = {k: v for k, v in payload.items() if v is not None}
+    # Do NOT remove None values - Onyx API might expect explicit nulls
+    # payload = {k: v for k, v in payload.items() if v is not None}
     
     return payload