Im not sure which item causes this bug, but since i've got the "War Ravaged Weaponry" item in my bag I get this error popping up everytime I open my bags.

Error:

7x ...\AdiBags\libs\18LibItemUpgradeInfo-1.0-6\Core.lua:177: attempt to index a nil value
...\AdiBags\libs\18LibItemUpgradeInfo-1.0-6\Core.lua:177: in function "GetHeirloomTrueLevel"
...\AdiBags\libs\18LibItemUpgradeInfo-1.0-6\Core.lua:199: in function "GetUpgradedItemLevel"
AdiBags-v1.8.1\modules\ItemLevel.lua:118: in function "?"
libs\CallbackHandler-1.0\CallbackHandler-1.0-6.lua:145: in function <libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:145>
:"safecall Dispatcher[2]":4: in function :"safecall Dispatcher[2]":4

:"safecall Dispatcher[2]":13: in function "?"
libs\CallbackHandler-1.0\CallbackHandler-1.0-6.lua:90: in function "SendMessage"
AdiBags-v1.8.1\widgets\ItemButton.lua:308: in function "Update"
AdiBags-v1.8.1\widgets\ItemButton.lua:280: in function "FullUpdate"
AdiBags-v1.8.1\widgets\ItemButton.lua:245: in function <AdiBags\widgets\ItemButton.lua:234>

AdiBags-v1.8.1\widgets\Section.lua:112: in function <AdiBags\widgets\Section.lua:110>

AdiBags-v1.8.1\widgets\ContainerFrame.lua:920: in function "PrepareSections"
AdiBags-v1.8.1\widgets\ContainerFrame.lua:1024: in function "FullUpdate"
AdiBags-v1.8.1\widgets\ContainerFrame.lua:547: in function <AdiBags\widgets\ContainerFrame.lua:533>

AdiBags-v1.8.1\core\Utility.lua:89: in function <AdiBags\core\Utility.lua:81>
AdiBags-v1.8.1\widgets\LayeredRegion.lua:119: in function <AdiBags\widgets\LayeredRegion.lua:108>

Locals:
nil

This is a bug in LibItemUpgradeInfo-1.0-6, which has been fixed recently. Should be fixed with next update.