Here it is a bug that Mode can be nil.
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-- Mode initialized elsewhere. Available modes: run, error
-- Available modes: run, error if Mode == nil then -- might have already been initialized elsewhere Mode = 'run' end
-- Available modes: run, error
if Mode == nil then -- might have already been initialized elsewhere
Mode = 'run'
end
-- Available modes: run, version_check Mode = 'run'
-- Available modes: run, version_check