fix: update head text query in SessionIframe.tsx #3738
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Closes #3737. According to TypeScript's DOM types, `contentDocument.head` should always exist but in practice we can sometimes see a "Cannot read properties of null (reading 'querySelector')" error.
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Closes #3737.
According to TypeScript's DOM types,
contentDocument.headshould always exist but in practice we can sometimes see a "Cannot read properties of null (reading 'querySelector')" error.