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