[HELP] Fatal Problem

[K4stic]

says error: attempt to perform arithmetic on a nil value

setElementData ( source, "cans", tonumber(getElementData(source, "cans") or 0) + cans, false ) 

[Castillo]

local currentCans = tonumber ( getElementData ( source, "cans" ) ) or 0 
setElementData ( source, "cans", currentCans + cans, false ) 

[K4stic]

thx it's work

i will say you if i find bug because i have fix with help of community and some my self that 5-6 time's and still bugget after 1 day

[Castillo]

You're welcome.

[50p]

says error: attempt to perform arithmetic on a nil value

setElementData ( source, "cans", tonumber(getElementData(source, "cans") or 0) + cans, false ) 

If you still want that in 1 line which I would unless you need to use current cans number more than once, you need to pay close attention to brackets:

setElementData ( source, "cans", ( tonumber( getElementData(source, "cans" ) ) or 0 ) + cans, false )