Describe what you were doing when the bug occurred:

Profiled the new FB. Scrolled down to tail loads.

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DevTools version: 4.6.0-a2fb84beb

Call stack: at chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:345591
    at Array.map (<anonymous>)
    at chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:345397
    at Ai (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:32:62580)
    at zl (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:32:112694)
    at jc (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:32:104789)
    at Oc (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:32:104717)
    at Tc (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:32:104585)
    at gc (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:32:101042)
    at chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:32:47376

Component stack: at chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:344679
    at div
    at div
    at n (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:194307)
    at div
    at Cc (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:346311)
    at div
    at n (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:3:8163)
    at div
    at bc
    at div
    at div
    at div
    at Do (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:262081)
    at chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:364048
    at n (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:274563)
    at chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:277138
    at div
    at div
    at ol (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:323458)
    at Ze (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:205764)
    at pn (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:215038)
    at $a (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:292153)
    at ws (chrome-extension://dnjnjgbfilfphmojnmhliehogmojhclc/build/main.js:40:369231)
priorityLevel,
            timestamp,
          }) => ({
            changeDescriptions:
              changeDescriptions != null
                ? Array.from(changeDescriptions.entries())
                : null,
            duration,
            fiberActualDurations: Array.from(fiberActualDurations.entries()),
            fiberSelfDurations: Array.from(fiberSelfDurations.entries()),
            interactionIDs,
            priorityLevel,
            timestamp,
          }),
        ),
        displayName,
        initialTreeBaseDurations: Array.from(
          initialTreeBaseDurations.entries(),
        ),
        interactionCommits: Array.from(interactionCommits.entries()),
        interactions: Array.from(interactions.entries()),
        operations,
        rootID,
        snapshots: Array.from(snapshots.entries()),
      });
    },
  );
  return {
    version: PROFILER_EXPORT_VERSION,
    dataForRoots,