Hello
Nature doesn't like a vacuum, neither does LUA.
Thank you for your great work, I like it very much

3x RCLootCouncil_Classic\RCLootCouncil\core.lua:1344: attempt to perform arithmetic on local 'ilvl' (a nil value)
[string "@RCLootCouncil_Classic\RCLootCouncil\core.lua"]:1344: in function GetIlvlDifference' [string "@RCLootCouncil_Classic\RCLootCouncil\core.lua"]:1506: in function SendLootAck'
[string "@RCLootCouncil_Classic\RCLootCouncil\core.lua"]:755: in function origHandler' [string "@RCLootCouncil_Classic\Core\Comms.lua"]:93: in function <RCLootCouncil_Classic\Core\Comms.lua:87> [string "@RCLootCouncil_Classic\Core\Comms.lua"]:117: in function ?'
[string "@AdiBags\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ags\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119>
[string "=[C]"]: ?
[string "@AdiBags\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ags\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
[string "@AdiBags\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function `Fire'
[string "@BugSack\Libs\AceComm-3.0\AceComm-3.0-12.lua"]:260: in function <...faceBugSack\Libs\AceComm-3.0\AceComm-3.0.lua:242>

Thanks for the report. Not really sure how that can happen, as it would require an item in session to somehow not have an ilvl, which should be impossible.
Either way I've added a check for it.