An error occurred in Firefox Profiler while analysing a profile

I had profiled https://battle.modez.pro/ , and was looking at the profile. Suddenly got this error:

Uh oh, some unknown error happened in profiler.firefox.com.

Error: Expected an item to exist, and it was undefined..

Please report this issue to the developers, including the full error as displayed in the Developer Tools’ Web Console.

Error in console: 10:14:49.724 injected firefox content.js:142:11 10:14:49.858 Successfully compiled asm.js code (total compilation time 27ms) zee-worker.js 10:15:07.345 Error: Expected an item to exist, and it was undefined. h flow.js:182 render SampleTooltipContents.js:136 React 10 react-dom.production.min.js:188:119 React 11 10:15:07.345 An unhandled error was thrown in a React component. Error: Expected an item to exist, and it was undefined. h flow.js:182 render SampleTooltipContents.js:136 React 10

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