Sidekiq job failing: Wrapped EOFError: end of file reached

Next Retry Retry Count Queue Job Arguments Error
in 14 hours 15 default Jobs::ProcessPost {bypass_bump=>false, cooking_options=>nil, new_post=>true, post_id=>1625570, skip_pull_hotlinked_images=>false, image_sizes=>{https://f5i4i8k5.stackpathcdn.com/letter_avatar_proxy/v4/letter/k/7ea924/20.png=>{width=>20, height=>20}}, current_site_id=>default} Jobs::HandledExceptionWrapper: Wrapped EOFError: end of file reached

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Any idea where does this error come from?