so here is the script

local trgt = sim.pmap(39, 356)

local crnt = 0x3fffffff
local er1 = 1
local er2 = 1
check1 = function()
 for i=15, 350 do
  if sim.pmap(40, i) ~= nil then
   if sim.partProperty(sim.pmap(40, i), "dcolour") == sim.partProperty(sim.pmap(40, 351), "dcolour") then
    sim.partKill(40, 351)
   end
  else
   er1 = 2
  end
 end
end
check2 = function()
 for i=15, 350 do
  if sim.pmap(41, i) ~= nil then
   if sim.partProperty(sim.pmap(41, i), "dcolour") == sim.partProperty(sim.pmap(40, 351), "dcolour") then
    sim.partKill(40, 351)
   end
  else
   er2 = 2
  end
 end
end
F = function()
 sim.partProperty(trgt, "ctype", crnt-1)
 crnt = crnt-1
end
event.register(event.aftersim, F)
event.register(event.aftersim, check1)
event.register(event.aftersim, check2)

the problem is that even though I have it so it wont run the nested "if" if it gets a nil, but it still gives an error saying that "line 8 partProperty was expecting a number but got nil" even though it shouldn't run that "if" if it gets nil.

@LBPHacker (View Post)

 That was it thanks for the help