[Ketho]

I don't know if there are any addons for specifically this, but this snippet should be able to do what you want

local f = CreateFrame("Frame")
 
local function OnEvent(self, event)
    if event == "PARTY_INVITE_REQUEST" and UnitIsAFK("player") then
        AcceptGroup()
        f:RegisterEvent("PARTY_MEMBERS_CHANGED")
    elseif event == "PARTY_MEMBERS_CHANGED" then
        StaticPopup_Hide("PARTY_INVITE")
        f:UnregisterEvent("PARTY_MEMBERS_CHANGED")
    end
end
 
f:RegisterEvent("PARTY_INVITE_REQUEST")
f:SetScript("OnEvent", OnEvent)

http://www.mmo-champion.com/threads/...lve-easy-steps