Comparing Nil to Number

I am in need of help, I have searched on google and cant figure it out.

I am trying to display info on a monitor (which is working).

every time i run the program i get

attempt to compare nil with number

its on line 140 in function getTurbineStats() I will post the code below. Everything was working until i tried to round the number.

local core = peripheral.wrap("draconic_rf_storage_4")
local turbineA = peripheral.wrap("BigReactors-Turbine_12")
local turbineB = peripheral.wrap("BigReactors-Turbine_13")
local mon = peripheral.wrap("monitor_26")
local version = "3.4"
local tier = 0
local rounded = 0
local turbineASpeed = 50
local turbineBSpeed = 50
local turbineASpeedround = 0
local turbineASpeedround = 0

local function startUpProcedure()
term.clear()
term.setCursorPos(1,1)
rs.setOutput("left", false)
print("Monitoring Power")
term.setCursorPos(18,1)
print("| Tier - " ..tier)
end
local function getInfos()
energyStored = core.getEnergyStored()
energyMax = core.getMaxEnergyStored()
turbineASpeed = turbineA.getRotorSpeed()
turbineBSpeed = turbineB.getRotorSpeed()

activeReactor = rs.getOutput("left")


end
local function displayInfos()
if energyStored < 3952000000 then --if core is less then 40% - 3952000000
  rs.setOutput("left", true)
  term.setCursorPos(1, 3)
  print("Energy Reading ")
  term.setCursorPos(1, 4)
  print(energyStored)
  mon.setCursorPos(1,1)
  mon.setTextColor(colors.white)
  mon.write("Energy Reading ")
  mon.setCursorPos(1,2)
  mon.write(rounded)
  mon.setCursorPos(1, 3)
  mon.setTextColor(colors.green)
  mon.write("Reactor Status-ON")
  mon.setTextColor(colors.white)
  mon.setCursorPos(1, 6)
  mon.write("Turbine A Speed - ")
  mon.setCursorPos(1, 7)
	mon.write(turbineASpeedround)
	mon.setCursorPos(1,8)
  mon.write("Turbine B Speed - ")
	mon.setCursorPos(1,9)
	mon.write(turbineBSpeedround)
elseif energyStored >= 9800000000 then --if core is 98ish% full
  rs.setOutput("left", false)
  term.setCursorPos(1, 3)
  print("Energy Reading ")
  term.setCursorPos(1, 4)
  print(energyStored)
  mon.setCursorPos(1,1)
  mon.setTextColor(colors.white)
  mon.write("Energy Reading ")
  mon.setCursorPos(1,2)
  mon.write(rounded)
  mon.setCursorPos(1, 3)
  mon.setTextColor(colors.red)
  mon.write("Reactor Status-OFF")
  mon.setTextColor(colors.white)
  mon.setCursorPos(1, 6)
  mon.write("Turbine A Speed - ")
   mon.setCursorPos(1,7)
   mon.write(turbineASpeedround)
  mon.setCursorPos(1, 8)
  mon.write("Turbine B Speed - ")
   mon.setCursorPos(1,9)
   mon.write(turbineBSpeedround)
else
  term.setCursorPos(1, 3)
  print("Energy Reading ")
  term.setCursorPos(1, 4)
  print(energyStored)
  mon.setCursorPos(1,1)
  mon.setTextColor(colors.white)
  mon.write("Energy Reading")
  mon.setCursorPos(1,2)
  mon.write(rounded)
  if activeReactor == "true" then
   mon.setCursorPos(1, 3)
   mon.setTextColor(colors.green)
   mon.write("Reactor Status-ON")
  else
   mon.setCursorPos(1, 3)
   mon.setTextColor(colors.red)
   mon.write("Reactor Status-OFF")
  end
  mon.setTextColor(colors.white)
  mon.setCursorPos(1, 6)
  mon.write("Turbine A Speed - ")
   mon.setCursorPos(1,7)
	mon.write(turbineASpeedround)
  mon.setCursorPos(1, 8)
  mon.write("Turbine B Speed - ")
	mon.setCursorPos(1,9)
	mon.write(turbineBSpeedround)
end

sleep(1)
end
local function getTier() --gets tier of Draconic Core
energyMax = core.getMaxEnergyStored()

if energyMax < 50000000 then
  tier = 1
elseif energyMax < 300000000 then
  tier = 2
elseif energyMax < 2000000000 then
  tier = 3
elseif energyMax < 10000000000 then
  tier = 4
elseif energyMax < 50000000000 then
  tier = 5
elseif energyMax < 400000000000 then
  tier = 6
elseif energyMax < 3000000000000 then
  tier = 7
else
  tier = 8
end
end

local function getTurbineStats()
--if turbines are less then 100 RPM they will default to not being rounded.
if turbineASpeed > 100.00 then
  turbineASpeedround = math.floor(turbineASpeed, 2)
else
  turbineASpeedround = turbineASpeed
end

if turbineBSpeed > 100.00 then
  turbineBSpeedround = math.floor(turbineBSpeed, 2)
else
  turbineBSpeedround = turbineBSpeed
end
end

--startup  (as soon as the computers booted)
getTier()
startUpProcedure()
while true do
getInfos()
getTurbineStats()
displayInfos()
end

ill try to give more info if needed.

Thanks
L4GSPike

Line 140 reads:

if turbineBSpeed > 100.00 then

Assuming this is the actual script file you're running (check your filenames!), the only way I can see where "turbineBSpeed" could be set to nil when that line executes is if turbineB.getRotorSpeed() (called on line 25) is returning that value: and I wouldn't expect it to ever be doing that. I suggest testing it out in the Lua console to see if that reactor is functionally normally or not.

It's an unrelated niggle, but I notice you've got an A on line 11, where you mean to have a B.