If NULL or meets condition then continue in R

I want to check if x is NULL/NA/NAN and if it is, then carry out the function. I also want to carry out the function if x is not between a min and a max number.

If I do:

#Checks if blank
isnothing <-  function(x) {
  any(is.null(x))  || any(is.na(x))  || any(is.nan(x)) 
}


x <- as.numeric(NULL)
min <- 25
max <- 45

#Actual function
if (isnothing(x) | !between(x,min,max)) {
    #Do something
}

I get the dreaded "argument is of length zero in if statement" error in R

I also tried:

x <- as.numeric(NULL)
min <- 25
max <- 45

if (isnothing(x) |(!isnothing(x) & !between(x,min,max))) {
    #Do something
}

This still doesn't work