Attempt to index local 'contact' a nil value

Getting Started Newbie Questions
#1

Currently, I am working on pre-collision for one-way platforms. I am pleased with the result but occasionally I get this error:

ERROR: Runtime error characterfunctions.lua:216: attempt to index local 'contact' (a nil value) stack traceback: characterfunctions.lua:216: in function '?' ?: in function \<?:190\>

I am not sure what’s causing it, and how to isolate it, but here’s the code:

 local contact = event.contact -- Line 212 local other = event.other if( other.isFloating ) then if( contact.isEnabled and self.y \> other.y - other.height / 2) then contact.isEnabled = false end end -- Line 219

The error is the first line in the first if statement of this code. 

Any help would be greatly appreciated, thanks!

#2

Easy fix would be to not process if no contact.

 local contact = event.contact local other = event.other if( contact and other and other.isFloating ) then if( contact.isEnabled and self.y \> other.y - other.height / 2) then contact.isEnabled = false end end

Note: This sound a lot to me like you’re processing an object that just got deleted or was not correctly destroyed, but that is just a guess.

#3

Neither of the processed objects are going to be destroyed at any time of the level unless the player dies, but I have not written the character’s death code yet.

#4

Also, thanks! It worked.

#5

Easy fix would be to not process if no contact.

 local contact = event.contact local other = event.other if( contact and other and other.isFloating ) then if( contact.isEnabled and self.y \> other.y - other.height / 2) then contact.isEnabled = false end end

Note: This sound a lot to me like you’re processing an object that just got deleted or was not correctly destroyed, but that is just a guess.

#6

Neither of the processed objects are going to be destroyed at any time of the level unless the player dies, but I have not written the character’s death code yet.

#7

Also, thanks! It worked.