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mod_compat_roles: Fix attempt to index a nil value #1847 permissions[] is not a map with role names as keys since 817bc9873fc2 but instead a level with host names were added. This was likely an oversight. Refactored towards railroad.

module:hook("message/host", function (event)
	local stanza = event.stanza;
	if #stanza.tags == 1 and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/chatstates" then
		return true;
	end
end, -10);