Which software were you running?

• Addon version name:
• Client used: [e.g. Vanilla 1.14.4, Retail PTR x.x.x, etc]

Have you read the changelog?
Mark if read.

Please describe the bug.
A clear and concise description of what the bug is.

Just opening the bank produces this error.

Please describe how to reproduce it.

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Any Screenshots?
If applicable, please add screenshots to help explain your problem.

Error Logs are Important!
Type /console scriptErrors 1 in the chat and reload the game. If an error window appears when reproducing the bug, please write here the first message (labelled 1/Many) that appeared. ⚠️ By default, the last error message is shown, not the first! You need to navigate back to the first error.

10x BagBrother/core/classes/currency.lua:22: bad argument #2 to 'format' (string expected, got nil)
[string "=[C]"]: in function format' [string "@BagBrother/core/classes/currency.lua"]:22: in function Set'
[string "@BagBrother/core/classes/currencyTracker.lua"]:79: in function AddButton' [string "@BagBrother/core/classes/currencyTracker.lua"]:66: in function Layout'
[string "@BagBrother/core/classes/currencyTracker.lua"]:37: in function RegisterEvents' [string "@BagBrother/core/classes/currencyTracker.lua"]:23: in function <...eBagBrother/core/classes/currencyTracker.lua:18> [string "=(tail call)"]: ? [string "@Bagnon/src/frame.lua"]:308: in function PlaceCurrencies'
[string "@Bagnon/src/frame.lua"]:93: in function Layout' [string "@Bagnon/src/frame.lua"]:62: in function Update'
[string "@Bagnon/src/frame.lua"]:52: in function RegisterSignals' [string "@BagBrother/core/classes/frameBase.lua"]:22: in function <BagBrother/core/classes/frameBase.lua:20> [string "=[C]"]: in function Show'
[string "@BagBrother/core/api/frames.lua"]:32: in function `Show'
[string "@BagBrother/core/features/autoDisplay.lua"]:61: in function <...faceBagBrother/core/features/autoDisplay.lua:60>

Locals:
(*temporary) = "%s|T%s:14:14:2:0%s|t "
(*temporary) = nil
(*temporary) = 135947
(*temporary) = ""
(*temporary) = "string expected, got nil"

Solution:
BagBrother/core/classes/currency.lua in line 22 change:
self:SetText(format('%s|T%s:14:14:2:0%s|t ', data.quantity, data.iconFileID, data.iconArgs or ''))
to:
self:SetText(format('%s|T%s:14:14:2:0%s|t ', data.quantity or 0, data.iconFileID or 0, data.iconArgs or ''))

In also solves errors when displaying bank contents via inventory