File already exists error

[rauchg]

We are getting user reports from an error like this:

EEXIST: file already exists, mkdir '/var/folders/b4/n_nm8w3941n1gk3bd5tn4fxm0000gn/T/update-check'

{
code: EEXIST, 
errno: -17, 
path: /var/folders/b4/n_nm8w3941n1gk3bd5tn4fxm0000gn/T/update-check, 
syscall: mkdir
}

Most worryingly, it's an unhandled promise rejection.