Need help with an old addon (postal)

[Zimzarina]

I have made a couple of small updates to bring postal back to working for 9.0.1. However, I have run into an issue I have been trying to debug for a few days and I am simply not figuring it out. The latest release can be obtained at https://www.curseforge.com/wow/addon.../files/3092023
The issue is if a secure hook is added to the AutoComplete_Update function even if this hook does nothing it will generate a runtime lua error in AutoComplete_Update.lua at line 401 when inviting a member to the new community's added recently. Tracking as issue #231 on curseforge for this addon.
Thanks to anyone who has an idea on what's going on here.

[Zimzarina]

Please disregard.