Yes, that's technically true, but you have to admit a little contrived, especially as pertaining to function pointers/references.
I'll amend my statement to "unlike pointers, valid references cannot point to a null address."
This is also true of any other language which has both nullable and non-nullable references, and a way to convert the former to the latter without accounting for the null case, such as Rust[1].
fn pass_null_reference() {
unsafe { print_i32(&*std::ptr::null()) }
}
fn print_i32(n: &i32) {
println!("{}", n) // segfault
}