Running Software (issues missing this information will be deleted):

• Addon version: 10.0.16
• Server patch: 3.4.2.50172 (WotLK Classic)

Have you read the changelog? (please don't waste our time)
Yes

Describe the bug
Lua error when search bank while not at the bank

To Reproduce
Steps to reproduce the behaviour:

1. Press "b" to open bags
2. Right click on Bagnon button to open bank slots.
3. Click on the Search button and type "x" (or anything else).
4. Lua error pops up - see screenshot.

Expected behaviour
Expected to just see matching items highlighted.

Screenshots

Error Logs
None given

Additional context
This has been going on for months. Occurs whether other add-ons are enabled or just Bagnon (and its included BagBrother, Bagnon Config and Bagnon Guild Bank) loaded.

One additional comment: BagBrother is using a version of Ace3 that dates back to 2018:
BagBrother\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:--[[ $Id: CallbackHandler-1.0.lua 22 2018-07-21 14:17:22Z nevcairiel $ ]]
This older version is KNOWN to be incompatible with current WoW.

Can you at least update to current Ace3??