Just dumping this here before I forget

8x SavedInstances\SavedInstances-@[email protected]:1650: bad argument #1 to 'GetAzeriteItemXPInfo' (Usage: local xp, totalLevelXP = C_AzeriteItem.GetAzeriteItemXPInfo(azeriteItemLocation))
[C]: in function GetAzeriteItemXPInfo' SavedInstances\SavedInstances-@[email protected]:1650: in function UpdateToonData'
SavedInstances\SavedInstances-@[email protected]:3152: in function Refresh' SavedInstances\SavedInstances-@[email protected]:2585: in function <SavedInstances\SavedInstances.lua:2585> [C]: ? Ace3\AceBucket-3.0\AceBucket-3.0-4.lua:73: in function <Ace3\AceBucket-3.0\AceBucket-3.0.lua:71> Ace3\AceBucket-3.0\AceBucket-3.0-4.lua:89: in function func'
Ace3\AceTimer-3.0\AceTimer-3.0-17.lua:57: in function <Ace3\AceTimer-3.0\AceTimer-3.0.lua:50>

I tried unequip and equip, and reloading ui when unequipped, but I still can't reproduce this

Hah, you have to put it into your bank

I suggest something like

if not azeriteItemLocation:IsEquipmentSlot() then
	return
end

Still can't reproduce for me :(

Steps here

1. I put the Heart of Azeroth into bank, and open SI's tooltip, no Lua error.
2. Then I reloaded ui, and open SI's tooltip, no Lua error.
3. I exited the game completely , login and open SI's tooltip, no Lua error.
4. I notice my ElvUI databar is still working, then I disable all other addons, reloaded ui or exited the game, then open SI's tooltip, still no Lua error.

Quite weird, but I guess it's blizzard's issue and it was fixed, since it's possible to get info when HoA is in bank. ElvUI got issue like this on Nov 30, 2018, and it just gone.

I'm getting a similar error on 1708. In my case, my druid is 111 (never set foot in BFA, hit 111 through dungeons/timewalking/etc). The only way to prevent this error from constantly being displayed (whenever I try to view SavedInstances) was to comment out the code:

if azeriteItemLocation then
    -- local xp, totalLevelXP = C_AzeriteItem.GetAzeriteItemXPInfo(azeriteItemLocation)
    -- local currentLevel = C_AzeriteItem.GetPowerLevel(azeriteItemLocation)
    -- t.Artifact = format("%d (%d%%)", currentLevel, xp / totalLevelXP  * 100)
  end

Error that is constantly being thrown:

Message: Interface\AddOns\SavedInstances\SavedInstances-8.1.4.lua:1708: bad argument #1 to 'GetAzeriteItemXPInfo' (Usage: local xp, totalLevelXP = C_AzeriteItem.GetAzeriteItemXPInfo(azeriteItemLocation))
Time: Sat Jun 15 22:10:07 2019
Count: 3
Stack: Interface\AddOns\SavedInstances\SavedInstances-8.1.4.lua:1708: bad argument #1 to 'GetAzeriteItemXPInfo' (Usage: local xp, totalLevelXP = C_AzeriteItem.GetAzeriteItemXPInfo(azeriteItemLocation))
Locals: