I actually put ==nil without even thinking about it

Yeah that fixed it crashing but doesnt look it will upgrade them but better than nothing, thanks.

Have the BeltUpgrader mod installed and its always crashing at the same location:
__BeltUpgrader__/control.lua:379: attempt to get length of field 'neighbours' (a nil value)"

if #under.neighbours == 0 then --This is an orphaned underground belt
local ghost = roboport.surface.create_entity{name ...

I liked my friend convinced me to get and I host a headless server VM that we are using. Have like 45hrs on this one map so far.