I think something might have changed in recent versions, but i received this when opening my powerarmor.
Picture; https://i.imgur.com/Wab5Azx.jpg
Pastebin; https://pastebin.com/fReZgVGG

According to api-lua LuaEquipmentGrid really doesn't contain "name" (disclaimer, i'm new at this mod/lua stuff) http://lua-api.factorio.com/latest/LuaEquipmentGrid.html but http://lua-api.factorio.com/latest/LuaEquipmentGridPrototype.html does contain name. Perhaps the variable isn't referencing Prototype?

in control.lua i replaced the line:

local prefix = string.sub(opened.name,1,15)

with the following:

local jimsTest = "NO"

for jimX,jimY in ipairs(opened) do
if jimX == "name" then
jimsTest = "YES"
end
end

if jimsTest == "YES" then
local prefix = string.sub(opened.name,1,15)
else
local prefix = "NO"
end

and thats got the game working for me again :)

nope not quite, that's switched off trading for all containers, not just ones that don't contain the name field anymore :(

nope not quite, that's switched off trading for all containers, not just ones that don't contain the name field anymore :(

I'm having the same issue when I open my armor. Any progress?

https://forums.factorio.com/viewtopic.php?f=11&t=59790#p362836