Update app.py

app.py

@@ -126,7 +126,6 @@ def main():
     st.write("<!-- End Spacer -->", unsafe_allow_html=True)
 
     new_messages_placeholder = st.empty()
-    
     loading_message = None  # Initialize the loading_message variable
 
     if pdf_path is not None:
@@ -148,7 +147,7 @@ def main():
         if st.button("Ask") or (not st.session_state['chat_history'] and query) or (st.session_state['chat_history'] and query != st.session_state['chat_history'][-1][1]):
             st.session_state['chat_history'].append(("User", query, "new"))
 
-            loading_message = st.empty()
+            loading_message = st.empty()  # Assign the loading_message variable here
             loading_message.text('Bot is thinking...')
 
             VectorStore = load_pdf(pdf_path)
@@ -175,8 +174,6 @@ def main():
             # Scroll to the latest response using JavaScript
             st.write("<script>document.getElementById('response').scrollIntoView();</script>", unsafe_allow_html=True)
 
-            loading_message.empty()
-
             # Clear the input field by setting the query variable to an empty string
             query = ""
 
@@ -190,16 +187,11 @@ def main():
             background_color = "#FFA07A" if chat[2] == "new" else "#D1D1E0" if chat[0] == "User" else "#D1D1E0"  # Use a very light purple-grey color
             new_messages_placeholder.markdown(f"<div style='background-color: {background_color}; padding: 10px; border-radius: 10px; margin: 10px;'>{chat[0]}: {chat[1]}</div>", unsafe_allow_html=True)
 
-
-        
         # Scroll to the latest response using JavaScript
         st.write("<script>document.getElementById('response').scrollIntoView();</script>", unsafe_allow_html=True)
 
-        loading_message.empty()
-
-        # Clear the input field by setting the query variable to an empty string
-        query = ""
-
+        if loading_message is not None:
+            loading_message.empty()  # Call empty() only if loading_message is not None
 
 
 def display_chat_history(chat_history):