Attempt to compare nil with number on (i).x < 100 then - lua

Question

I am trying to spawn a new display.newRect if to old one is < 100 but I'm getting a 'Attempt to compare nil with number'
function hollSpawne(i)
if (i).x < 100 then
hollspawn()
end
end
HollControll = timer.performWithDelay( 1400 , hollSpawne, 0 )
I cant see the error, could someone please explain how to fix this ?
Fullcode :
function pluspoint(i)
score = score + 1
display.remove(i)
end
screenGroup = self.view
holl = {}
hollSpawn = function()
i = display.newRect( 0, 0, math.random(10, 500), 53 )
i.x = display.contentWidth + i.contentWidth + 10
i.y = display.contentHeight - 53/2
i:setFillColor( 1, 0, 0 )
i.name = "hollgameover"
physics.addBody(i, "static", {density=.1, bounce=0.5, friction=.2,filter=playerCollisionFilter } )
trans55 = transition.to(i,{time=2000, x=display.contentWidth - display.contentWidth - i.contentWidth/2 - 20, onComplete=pluspoint, transition=easing.OutExpo } )
holl[#holl+1] = i
screenGroup:insert(i)
end
timereholl = timer.performWithDelay( 100 , hollSpawn, 1 )
function hollSpawne(i)
if (i).x < 100 then
hollspawn()
end
end
HollControll = timer.performWithDelay( 1400 , hollSpawne, 0 )
-
-
new test still not working
screenGroup = self.view
holl = {}
hollSpawn = function()
i = display.newRect( 0, 0, math.random(10, 500), 53 )
i.x = display.contentWidth + i.contentWidth + 10
i.y = display.contentHeight - 53/2
i:setFillColor( 1, 0, 0 )
i.name = "hollgameover"
physics.addBody(i, "static", {density=.1, bounce=0.5, friction=.2,filter=playerCollisionFilter } )
trans55 = transition.to(i,{time=2000, x=display.contentWidth - display.contentWidth - i.contentWidth/2 - 20, onComplete=pluspoint, transition=easing.OutExpo } )
holl[#holl+1] = i
screenGroup:insert(i)
end
timereholl = timer.performWithDelay( 100 , hollSpawn, 1 )
function hollSpawne(event)
if (i).x < 100 then
hollSpawn()
end
end
HollControll = timer.performWithDelay( 1400 , hollSpawne, 0 )

Answer 1

Your timer calls hollSpawne with no arguments, but in function you use 'i' parameter.
Try this one:
local function hollSpawne(i)
if i.x < 100 then
hollspawn()
end
end
HollControll = timer.performWithDelay( 1400 , function()
hollSpawne(my_i_value)
end, 0 )

Answer 2

The timer calls the listener with event as argument so i is an event. Since i is a global you can just have the arg be event:
function hollSpawne(event)
if (i).x < 100 then
hollSpawn()
end
end
Note that I use hollSpawn not hollspawn as I think this is a typo that will cause additional bug.
Sidenote on style: not sure why you need () around i, un-Lua'ish. Also you probably should declare i local to your module:
local i
screenGroup = self.view
holl = {}
hollSpawn = function()
i = display.newRect( 0, 0, math.random(10, 500), 53 )
...