custom function with and array argument returning array+null (Google App Script)

Question

I have a custom function with the same structure as below,where a array is a argument, but when used, it returns/logs the array+ a null:

var ranges_pl1 = ["range!G2:G500"];
function compara_clientes(ranges_pl1){
  Logger.log(ranges_pl1);
  const ranges_pl1_lenght = ranges_pl1.length;
return some_array
}

function autoDepar(range_1){
  var lista_clientes_novos = compara_clientes(range_1);
  //more steps here
}


autoDepar(ranges_pl1)

The code runs normally, but it keeps giving that extra null from calling the array.