JS Garbage Collection

Whoops it did it again ... It happens when I detach timers and the LCD sleeps.
Last code is:

Bangle.on('lcdPower',on=>{
 console.log("LCD Event"); 
 if (on) {
    console.log("LCD Event ON");
    //state.screen=scrnClock;
    b.clear();
    if (state.screen==scrnClock) {
      writeTime();
      writeCircles();
      state.clockDots=false;
      writeClockDots();
      handleSecondClock=setInterval(clockUpdat­e, 1000);
    }
    if (state.screen==scrnDate) {
      writeDate();
    }
    g.drawImage({width:240,height:190,bpp:1,­buffer:b.buffer, palette: color},0,48);
  }else {
    if (handleSecondClock){
      console.log("LCD Event: Clearhandle");
      clearInterval(handleSecondClock);
      handleSecondClock = undefined;
  }
 }
});

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