Update app.py

app.py

@@ -87,12 +87,15 @@ def main():
     st.set_page_config(page_title="Gemini Chat QA", layout="wide")
     st.title("📄 Chat with Your Document using Gemini (Sayandip+Dhiraj+Fazal)")
 
+    # Initialize session state attributes if they don't exist
     if "conversation" not in st.session_state:
         st.session_state.conversation = []
     if "document_text" not in st.session_state:
         st.session_state.document_text = ""
     if "chat_active" not in st.session_state:
         st.session_state.chat_active = True
+    if "chat_history" not in st.session_state:  # Initialize chat_history
+        st.session_state.chat_history = []
 
     uploaded_file = st.file_uploader(
         "Upload a file (.txt, .docx, .csv, .xlsx, .pptx, .pdf, .html, .htm, .tex, .jpg, .jpeg, .png):",