Error when opening NPC's

[madman]

When opening some NPCs, I am getting this error in the console.

[9/10/2025 3:31:46 PM] [ERROR] Handler error: [string "W:npc"]:18: attempt to index global 'tabs' (a nil value)
[9/10/2025 3:31:46 PM] [ERROR] Handler error: [string "W:npc"]:18: attempt to index global 'tabs' (a nil value)

Madman..

[Trenloe]

I can't recreate this. Please provide an example NPC that causes this issue.