### 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
```
We 
       If 
      localPendingOperationsQueue.forEach(operations => {
        hook.emit('operations', operations);
      });
    } else {
       Bef
       our 
      if (trackedPath !== null) {
        mightBeOnTrackedPath = true;
      }
       If 
      hook.getFiberRoots(rendererID).forEach(root => {
        currentRootID = getFiberID(getPrimaryFiber(root.current));
        setRootPseudoKey(currentRootID, root.current);
         Han
        if (isProfiling && rootSupportsProfiling(root)) {
           If 
           The 
          currentCommitProfilingMetadata = {
            changeDescriptions: recordChangeDescriptions ? new Map() : null,
            durations: [],
            commitTime: getCurrentTime() - profilingStartTime,
            maxActualDuration: 0,
            priorityLevel: null,
            updaters: getUpdatersList(root),
            effectDuration: null,
            passiveEffectDuration: null,
          };
        }