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### Which website or app were you using when the bug happened?

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### What were you doing on the website or app when the bug happened?

If possible, please describe how to reproduce this bug on the website or app mentioned above:
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### Generated information

DevTools version: 4.13.1-93782cfed2

Call stack:
(none)

Component stack:
(none)

GitHub URL search query:
https://api.github.com/search/issues?q=Cannot%20add%20node%20%20because%20a%20node%20with%20that%20id%20is%20already%20in%20the%20Store.%20in%3Atitle%20is%3Aissue%20is%3Aopen%20is%3Apublic%20label%3A%22Component%3A%20Developer%20Tools%22%20repo%3Afacebook%2Freact
return 0;
    }
    const existingID = pendingStringTable.get(str);
    if (existingID !== undefined) {
      return existingID;
    }
    const stringID = pendingStringTable.size + 1;
    pendingStringTable.set(str, stringID);
     The string table total length needs to account
     both for the string length, and for the array item
     that contains the length itself. Hence + 1.
    pendingStringTableLength += str.length + 1;
    return stringID;
  }
  function recordMount(fiber: Fiber, parentFiber: Fiber | null) {
    if (__DEBUG__) {
      debug('recordMount()', fiber, parentFiber);
    }
    const isRoot = fiber.tag === HostRoot;
    const id = getOrGenerateFiberID(fiber);
    const hasOwnerMetadata = fiber.hasOwnProperty('_debugOwner');
    const isProfilingSupported = fiber.hasOwnProperty('treeBaseDuration');
    if (isRoot) {