### Describe what you were doing when the bug occurred:
1. I did profiling on a list, that gets updated on each pagination api call.
2. Once the profiling was done, I moved around in the Profiler to view the Flamegraph
3. Moving to second capture, the Profiler crashed.


**DevTools version**: 4.6.0-6cceaeb67

```
Component stack: in ec
    in div
    in div
    in div
    in So
    in Unknown
    in n
    in Unknown
    in div
    in div
    in rl
    in Ze
    in fn
    in Ga
    in _s
```
const appendComponentStack =
      window.__REACT_DEVTOOLS_APPEND_COMPONENT_STACK__ !== false;
    const breakOnConsoleErrors =
      window.__REACT_DEVTOOLS_BREAK_ON_CONSOLE_ERRORS__ === true;
    const showInlineWarningsAndErrors =
      window.__REACT_DEVTOOLS_SHOW_INLINE_WARNINGS_AND_ERRORS__ !== false;
    if (
      appendComponentStack ||
      breakOnConsoleErrors ||
      showInlineWarningsAndErrors
    ) {
      patchConsole({
        appendComponentStack,
        breakOnConsoleErrors,
        showInlineWarningsAndErrors,
      });
    }
  }
  const debug = (
    name: string,
    fiber: Fiber,
    parentFiber: ?Fiber,
    extraString?: string = '',
  ): void => {
    if (__DEBUG__) {
      const displayName =
        fiber.tag + ':' + (getDisplayNameForFiber(fiber) || 'null');
      const id = getFiberID(fiber);
      const parentDisplayName = parentFiber