Describe what you were doing when the bug occurred:
1. I was using the devtools to investigate some performance issues w/ an app I help maintain
2. I had just turned on the "Record why each component rendered while profiling" checkbox
3. I ran a profile while navigating on the underlying page

The react profiler tab in the devtools gave this error, I think as I clicked the record icon to stop recording the profile.

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DevTools version: 4.5.0-355970aa4

Call stack: at N (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:160881)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:160015)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)
    at j (chrome-extension://fmkadmapgofadopljbjfkapdkoienihi/build/main.js:40:159939)

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
mightBeOnTrackedPath = true;
      }
       If we have not been profiling, then we can just walk the tree and build up its current state as-is.
      hook.getFiberRoots(rendererID).forEach(root => {
        currentRootID = getFiberID(getPrimaryFiber(root.current));
        setRootPseudoKey(currentRootID, root.current);
         C
         w
        if (isProfiling && root.memoizedInteractions != null) {
           I
           T
          currentCommitProfilingMetadata = {
            changeDescriptions: recordChangeDescriptions ? new Map() : null,
            durations: [],
            commitTime: getCurrentTime() - profilingStartTime,
            interactions: Array.from(root.memoizedInteractions).map(
              (interaction: Interaction) => ({
                ...interaction,
                timestamp: interaction.timestamp - profilingStartTime,
              }),
            ),
            maxActualDuration: 0,
            priorityLevel: null,
          };
        }
        mountFiberRecursively(root.current, null, false, false);
        flushPendingEvents(root);
        currentRootID = -1;
      });
    }