I got the following error when I opened the mailbox after deleting a mail at the same time that I got removed from a dungeon instance:
Code:
EsoUI/Ingame/Mail/Keyboard/MailInbox_Keyboard.lua:440: attempt to index a nil value
stack traceback:
EsoUI/Ingame/Mail/Keyboard/MailInbox_Keyboard.lua:440: in function 'MailInbox:RefreshMailFrom'
EsoUI/Ingame/Mail/Keyboard/MailInbox_Keyboard.lua:398: in function 'MailInbox:OnInboxUpdate'
EsoUI/Ingame/Mail/Keyboard/MailInbox_Keyboard.lua:54: in function '(anonymous)'
GetMailData can return a nil value, but most instances where it is used do not protect against it. It's a minor bug that probably doesn't occur often, but it also doesn't require much to fix it.