Update app.py

app.py

@@ -205,14 +205,14 @@ def save_conversation(chat_history, session_id, page_number):
     # Check if the log file already exists
     existing_data = []
     if os.path.exists(filename):
-        with open(filename, 'r') as file:
+        with open(filename, 'r', encoding='utf-8') as file:
             existing_data = json.load(file)
         st.text(f"Existing data found in file: {filename}")
 
     # Append the new chat history to the existing data
     full_chat_history = existing_data + chat_history
 
-    with open(filename, 'w') as file:
+    with open(filename, 'w', encoding='utf-8') as file:
         json.dump(full_chat_history, file, indent=4)
     st.text(f"Conversation saved/updated in file: {filename}")