Error Value cannot be null

Error
Value cannot be null. (Parameter ‘source’)
Ticket Number: 264d470a24114a19a55b1eb392339b67

Snapshot 964115d9893c45c4907625bc6c568eea

What were you doing when this error happened? I tried the snapshot that you provided with Best in Bags and Best in Slot and did not receive an error…

I used “Add to my bag” in Upgrade Finder, and added Darkmoon Card: Greatness with agility.
Then I clicked Find Upgrades.
I tried it again, and it happened again.
If that is only thing I have in the list, it doesn’t happen.

These are the other items I have in that list:
Head
232
Conqueror’s Aegis Faceguard
delete
Neck
232
Shard of the Crystal Forest
delete
Wrist
213
Bracers of Dalaran’s Parapets
delete
Hands
232
Gauntlets of the Royal Watch
delete
Legs
232
Wyrmguard Legplates
delete
Trinket
200
Valor Medal of the First War
delete
Off
200
Crygil’s Discarded Plate Panel
delete
Finger
213
Signet of the Impregnable Fortress
delete

Thanks – I was able to reproduce the issue. We’ll fix it in the same site update we’re doing on mon or tues for the 10.1 dragonflight patch.