diff --git a/ui/pad-coms.ts b/ui/pad-coms.ts
index bf48b31..8b41498 100644
--- a/ui/pad-coms.ts
+++ b/ui/pad-coms.ts
@@ -1,5 +1,5 @@
 import { getDeviceInfo, getSensorTestData, getStageConfig } from "../sdk";
-import { SMX_USB_PRODUCT_ID, SMX_USB_VENDOR_ID } from "../sdk/api";
+import { API_COMMAND, SMX_USB_PRODUCT_ID, SMX_USB_VENDOR_ID } from "../sdk/api";
 import { SMXConfig } from "../sdk/commands/config";
 import { SMXDeviceInfo } from "../sdk/commands/data_info";
 import { SMXSensorTestData } from "../sdk/commands/sensor_test";
@@ -75,6 +75,9 @@ export async function requestConfig(dev: HIDDevice) {
 
 export async function requestTestData(dev: HIDDevice) {
   const response = await getSensorTestData(dev);
+  if (response[0] !== API_COMMAND.GET_SENSOR_TEST_DATA) {
+    return null;
+  }
   return new SMXSensorTestData(response);
 }
 
diff --git a/ui/stage/stage-test.tsx b/ui/stage/stage-test.tsx
index 979645d..5c58d31 100644
--- a/ui/stage/stage-test.tsx
+++ b/ui/stage/stage-test.tsx
@@ -33,7 +33,9 @@ function useTestData(device: HIDDevice | undefined) {
     const d = device;
     async function update() {
       const data = await requestTestData(d);
-      setTestData(data);
+      if (data) {
+        setTestData(data);
+      }
       handle = requestAnimationFrame(update);
     }