### 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
```
for (const id of fiberToErrorsMap.keys()) {
      fibersWithChangedErrorOrWarningCounts.add(id);
      updateMostRecentlyInspectedElementIfNecessary(id);
    }
    
    for (const id of fiberToWarningsMap.keys()) {
      fibersWithChangedErrorOrWarningCounts.add(id);
      updateMostRecentlyInspectedElementIfNecessary(id);
    }
    fiberToErrorsMap.clear();
    fiberToWarningsMap.clear();
    flushPendingEvents();
  }
  function clearErrorsForFiberID(id: number) {