In this [issue](https://github.com/facebook/react/issues/23373), when you navigate to [this app](https://next-rsc-notes.vercel.app/note/1646289027680) and inspect the sidebar in the components tab, you will get this error:

![image](https://user-images.githubusercontent.com/2735514/158241727-64eba8f9-5ac2-4aa7-bffa-ff9b3174a261.png)

 This is a user error. One of the components in the user's app thrown. However, the UI for this is confusing, because it seems like it's a DevTools error. We've gotten a lot of bug reports like this, and it would be good to differentiate between DevTools bugs and bugs in the app. For this task:

- [ ] Build the React DevTools extension locally (instructions [here](https://github.com/facebook/react/tree/main/packages/react-devtools-extensions)) and reproduce the error
- [ ] Figure out a way to have the front end be able to differentiate whether the error is a error within DevTools or within the user's app
- [ ] Design/implement a better UI to help app developers distinguish between these two cases
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    const isTimedOutSuspense =
      fiber.tag === ReactTypeOfWork.SuspenseComponent &&
      fiber.memoizedState !== null;
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      const primaryChildFragment = fiber.child;
      const fallbackChildFragment = primaryChildFragment
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        : null;
       S
      child = fallbackChildFragment ? fallbackChildFragment.child : null;
    }
    while (child !== null) {
       R
       W
      if (child.return !== null) {
        unmountFiberChildrenRecursively(child);
        recordUnmount(child, true);
      }
      child = child.sibling;
    }
  }
  function recordProfilingDurations(fiber: Fiber) {
    const id = getFiberIDThrows(fiber);
    const {actualDuration, treeBaseDuration} = fiber;
    idToTreeBaseDurationMap.set(id, treeBaseDuration || 0);
    if (isProfiling) {