inikulin / parse5 / 13884251676

99%

master: 99%

Pull #1435

github

fix: handle exhaustive stack popping

In some weird cases it seems you can end up trying to pop the element
stack until you basically reach `-1` (i.e. `indexOf` failed to find what
we want).

If that happens, the current element will be `undefined`. This change
adds some handling around that.

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