### 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
```
let nextChild = nextFiber.child;
        let prevChildAtSameIndex = prevFiber.child;
        while (nextChild) {
           We 
           the
           Sch
           We 
          if (nextChild.alternate) {
            const prevChild = nextChild.alternate;
            if (
              updateFiberRecursively(
                nextChild,
                prevChild,
                shouldIncludeInTree ? nextFiber : parentFiber,
                traceNearestHostComponentUpdate,
              )
            ) {
               If 
               chi
               pro
              shouldResetChildren = true;
            }
             How
             the 
             if 
            if (prevChild !== prevChildAtSameIndex) {
              shouldResetChildren = true;
            }
          } else {
            mountFiberRecursively(