Guillermo accidentally exposes the Baron to sunlight again during the episode titled "The Roast" from the fifth season of "What We Do in the Shadows." This incident occurs after the ancient vampire Baron Afanas has agreed to let Guillermo live. Despite having made peace, Guillermo once again inadvertently burns the Baron by opening the door and letting sunlight in, which burns the Baron to a crisp (though not as severely as before) source.
This accident is part of Guillermo's comedic misadventures and challenges within the series, emphasizing the humorous dynamics between vampires and their human familiar in the show. Here is an image from the episode:
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