Updates

app.py

@@ -166,11 +166,12 @@ st.sidebar.markdown(
     </div>
     """, unsafe_allow_html=True)
 
-# Get category description for tooltip
-category_description = modules[selected_category]["description"]
-
+# Sidebar content
 st.sidebar.title("Quiz Categories")
-selected_category = st.sidebar.selectbox("Choose a category:", list(modules.keys()), help=category_description)
+selected_category = st.sidebar.selectbox("Choose a category:", list(modules.keys()))
+
+# Get category description for tooltip
+category_description = modules[selected_category]["description"] if selected_category else ""
 
 if selected_category:
     module_options = [modules[selected_category][module]["title"] for module in modules[selected_category]]