Update app.py

app.py

@@ -167,6 +167,7 @@ else:
 csv_file = st.file_uploader("Upload a CSV file", type=["csv"])
 
 # Display the schema if an existing class is selected
+class_schema = None  # Initialize class_schema to None
 if selected_class != "New Class":
     st.write(f"Schema for {selected_class}:")
     class_schema = get_class_schema(selected_class)
@@ -176,7 +177,7 @@ if selected_class != "New Class":
         st.table(schema_df[["name", "dataType"]])  # Display only the name and dataType columns
 
 # Before ingesting data into Weaviate, check if CSV columns match the class schema
-if csv_file is not None:
+if csv_file is not None and class_schema:  # Ensure class_schema is not None
     data = csv_file.read().decode("utf-8")
     dataframe = pd.read_csv(StringIO(data))