Update app.py

app.py

@@ -414,17 +414,18 @@ elif app_mode == "Data Cleaning":
     if 'cleaned_data' not in st.session_state: #Added a conditional value
         st.session_state.cleaned_data = st.session_state.raw_data.copy()
 
-        # Check and copy cleaned data
+    # Check and copy cleaned data
     if st.session_state.cleaned_data is not None:
         df = st.session_state.cleaned_data.copy()
     else:
         st.warning("No cleaned data available. Please perform data cleaning first.")
-    
+        st.stop()  # Ensure the rest of the code doesn't execute if there's no cleaned data
 
     # --------------------------
     # Data Health Dashboard
     # --------------------------
     enhance_section_title("Data Health Dashboard", "📊")
+
     with st.expander("📊 Data Health Dashboard", expanded=True):
         col1, col2, col3 = st.columns(3)
         with col1: