"Oops! We ran into some problems" when switching style variation

I've only seen this on a single client's site, but I'm not sure what to make of it. We upgraded their style to 2.3 with variations enabled. They disabled the old 2.2 version, switched everyone to the new 2.3 version. Various users when switching to the dark mode get the oops error, with this in console:



The strange part is when the user switches to the default XenForo style, then back, they're able to use the variations then.

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