Update app.py

app.py

@@ -65,7 +65,7 @@ def app():
             st.session_state.timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
             initialize_game(st.session_state.player_name)
     
-    if "player_name" in st.session_state:
+    if "player_name" in st.session_state and "timestamp" in st.session_state:
         player_name, hp, last_action, turn = read_game_state(st.session_state.player_name, st.session_state.timestamp)
         
         st.write(f"{player_name} HP: {hp}")