fixed csv_file deletion

app.py

@@ -601,10 +601,11 @@ if selected_tab == 'Data Load':
         upload_csv_col, csv_template_col = st.columns([3, 1])
         if pricing_source == 'Paydirt DB':
             if st.button("Load from Paydirt DB"):
-                st.session_state['csv_file'] = load_csv(nfl_reg_salaries)
-                st.session_state['pricing_loaded'] = True
                 if 'csv_file' in st.session_state:
                     del st.session_state['csv_file']
+                st.session_state['csv_file'] = load_csv(nfl_reg_salaries)
+                st.session_state['pricing_loaded'] = True
+                
             try:
                 st.session_state['csv_file']['Salary'] = st.session_state['csv_file']['Salary'].astype(str).str.replace(',', '').astype(int)
             except: