DHT11 / clearWatch error weird behavior

So it seems scoping of setWatch affects readings. I'm not familiar with watch, but it seems to be a "special" citizen, defying normal expectations and capable of crashing everything after repeated use.

This works for some time before it fails with MEMORY.

var dht = require("https://raw.githubusercontent.c­om/tedd/Espruino_DHT11/master/DHT11_test­.js").connect(D27);

function readSensor() {
  dht.read(
    function (a) {
    console.log(a);
    setTimeout(readSensor, 5000);
  });
}

readSensor();