attempt to index field 'contact' (a nil value)

Getting Started Newbie Questions
#1

I used event.contact.Enabled=false for a pre collision event , and occasionally (maybe 1 time out of 20 times I run the program) I get attempt to index field ‘contact’ (a nil value). Is there a reason why? 

#2

I think it should be event.contact.isEnabled = false

#3

Thanks @guillopuyol, I do infact have isEnabled in the program, I misspelled when I wrote it here. I am wondering still why contact is considered a field.

#4

Could you post the relevant code?

#5

I think it should be event.contact.isEnabled = false

#6

Thanks @guillopuyol, I do infact have isEnabled in the program, I misspelled when I wrote it here. I am wondering still why contact is considered a field.

#7

Could you post the relevant code?