Update app.py

app.py

@@ -649,7 +649,9 @@ elif modus == "Upload csv-Datei":
                         # Mittelwerte pro System
                         df_mittel = df_alle.groupby("Name")[["Annuität_NK", "Annuität_NV", "Annuität_NB", "Annuität"]].mean(numeric_only=True).reset_index()
                         st.session_state["df_mittel"] = df_mittel
-                        st.session_state["annuitaeten_gesamt_batch"] = annuitaeten_gesamt                                    
+                        st.session_state["annuitaeten_gesamt_batch"] = annuitaeten_gesamt
+                        st.session_state["df_out"] = df_out
+                        
                 except Exception as e:
                     st.error(f"Fehler beim Einlesen/Berechnen: {e}")
 
@@ -683,6 +685,8 @@ elif modus == "Upload csv-Datei":
                     ).properties(height=350, width=650),
                     use_container_width=True
                 )
+
+            if "df_out" in st.session_state and st.session_state["df_out"] is not None:    
                 csv_buffer = io.StringIO()
                 df_out.to_csv(csv_buffer, sep=";", index=False)
                 csv_bytes = csv_buffer.getvalue().encode("utf-8")