new code

app.py

@@ -50,6 +50,6 @@ with gr.Blocks() as demo:
             gr.LinePlot(get_data, every=5, x="time", y="Temperature (°C)", y_title="TEMPERATURE(°C)", overlay_point=True, width=500, height=500,color_legend_position="bottom",)
             gr.Markdown("# 📈 FLOW RATE VS LEVEL")
             gr.LinePlot(get_data, every=5, x="Flow Rate (L/min)", y="Level (%)", x_title="FLOW RATE (L/MIN)",y_title="LEVEL (%)", overlay_point=True, width=500, height=500,color_legend_position="bottom",)
-    demo.load(lambda: get_data()['location'].iloc[-1], None, c_time2, every=5)
-    demo.load(lambda: get_data()['pump_status'].iloc[-1], None, c_time3, every=5)
+    demo.load(lambda: get_data()['location'].iloc[-1] if not get_data().empty else None, None, c_time2, every=5)
+    demo.load(lambda: get_data()['pump_status'].iloc[-1] if not get_data().empty else None, None, c_time3, every=5)
 demo.queue().launch()