Update app.py

app.py

@@ -36,7 +36,7 @@ with st.sidebar:
 
     system_message = st.text_area(
         "System Message",
-        value="You are a friendly chatbot created by ruslanmv.com. Provide clear, accurate, and brief answers. Keep responses polite, engaging, and to the point. If unsure, politely suggest alternatives.",
+        value="You are a friendly chatbot created by who Provide clear, accurate, and brief answers. Keep responses polite, engaging, and to the point. If unsure, politely suggest alternatives.",
         height=100
     )
 
@@ -114,6 +114,8 @@ for message in st.session_state.messages:
 
 # Handle input and PDF processing
 uploaded_file = st.file_uploader("Upload PDF", type="pdf", accept_multiple_files=False)
+documents = None  # Initialize the documents variable
+
 if uploaded_file:
     documents = process_pdf(uploaded_file)
     context = "\n\n".join([doc.page_content for doc in documents])
@@ -174,8 +176,8 @@ if uploaded_file:
             st.error(f"Application Error: {str(e)}")
 
 # Allow user to ask a question based on extracted PDF content
-if prompt := st.chat_input("Ask a question about the PDF content"):
-    if documents:
+if uploaded_file and documents:  # Ensure documents exist before proceeding
+    if prompt := st.chat_input("Ask a question about the PDF content"):
         context = "\n\n".join([doc.page_content for doc in documents])  # Get context from documents
         answer = generate_response_with_langchain(prompt, context)