This bug appears on login, only bugsack + bug grabber installed.

1x Auctionator\Auctionator-8.2.0.lua:146: Attempt to register unknown event "AUCTION_ITEM_LIST_UPDATE"
[string "=[C]"]: in function RegisterEvent' [string "@Auctionator\Auctionator-8.2.0.lua"]:146: in function Atr_RegisterEvents'
[string ":OnLoad"]:1: in function <[string ":OnLoad"]:1>

Locals:
(*temporary) = Atr_core {
0 =
}
(*temporary) = "AUCTION_ITEM_LIST_UPDATE"

Fixed by #428