### 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
```
} catch (error) {}
    bridge.send('isBackendStorageAPISupported', isBackendStorageAPISupported);
    bridge.send('isSynchronousXHRSupported', isSynchronousXHRSupported());
    setupHighlighter(bridge, this);
    setupTraceUpdates(this);
  }
  get rendererInterfaces(): {[key: RendererID]: RendererInterface, ...} {
    return this._rendererInterfaces;
  }
  clearErrorsAndWarnings = ({rendererID}: {|rendererID: RendererID|}) => {
    const renderer = this._rendererInterfaces[rendererID];
    if (renderer == null) {
      console.warn(`Invalid renderer id "${rendererID}"`);
    } else {
      renderer.clearErrorsAndWarnings();
    }
  };
  clearErrorsForFiberID = ({id, rendererID}: ElementAndRendererID) => {
    const renderer = this._rendererInterfaces[rendererID];
    if (renderer == null) {
      console.warn(`Invalid renderer id "${rendererID}"`);
    } else {
      renderer.clearErrorsForFiberID(id);
    }
  };
  clearWarningsForFiberID = ({id, rendererID}: ElementAndRendererID) => {
    const renderer = this._rendererInterfaces[rendererID];
    if (renderer == null) {
      console.warn(`Invalid renderer id "${rendererID}"`);
    } else {