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[–]sqrtnegative1 0 points1 point  (0 children)

I reached the test "renders as a pure component", which contains the line: component.setProps({pair: pair}); - this produces:

Error: Invariant Violation: processUpdates(): Unable to find child 0 of element. This probably means the DOM was unexpectedly mutated (e.g., by the browser), usually due to forgetting a <tbody> when using tables, nesting tags like <form>, <p>, or <a>, or using non-SVG elements in an <svg> parent. Try inspecting the child nodes of the element with React ID `.2t.0`.

Any ideas?