"stack imbalance" warning when use stri_encode in 0-row tibble

[meeeeeeeeo]

I find an issue when I use stri_encode in a 0-row tibble, below is the example code

library(dplyr)
library(stringi)

# no warning for length 0 character
x <- character(0)
stri_encode(x)

# warning in 0-row tibble
tibble(x = character(0)) %>% mutate(y = stri_encode(x))

[gagolews]

Thanks for the report, a fix is on the way.