Touches.map is not a function

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1

I have this code working fine earlier but instantly it started giving an error
e.touches.map is not a function!

Error place ButtonLogic.prototype.onTouchEnd

var ButtonLogic = pc.createScript('buttonLogic');

//initialize code called once per entity
ButtonLogic.prototype.initialize = function() {
    this.button = this.entity.button;
    this.button.on('mouseenter', this.onMouseEnter, this);
    this.button.on('mouseleave', this.onMouseLeave, this);

    this.button.on('touchstart', this.onTouchStart, this);
    this.button.on('touchend', this.onTouchEnd, this);

    this.button.on("destroy", ()=>{
        this.button.off('mouseenter', this.onMouseEnter, this);
    this.button.off('mouseleave', this.onMouseLeave, this);

    this.button.off('touchstart', this.onTouchStart, this);
    this.button.off('touchend', this.onTouchEnd, this);
    }, this);
};


// Having it this simplistic may cause problems if we ever have buttons overlapping each other
ButtonLogic.prototype.onMouseEnter = function(e) {
    Selector.instance.mouseOverButton = true;
};

ButtonLogic.prototype.onMouseLeave = function(e) {
    Selector.instance.mouseOverButton = false;
};

ButtonLogic.prototype.onTouchStart = function(e) {
    for (let touch of e.changedTouches) {
        Selector.instance.fire("addTouchID", touch.id);
    }
};

ButtonLogic.prototype.onTouchEnd = function(e) {
   //  Complex version (no leftovers)
    let eventTouchIDs = e.touches.map(touch => touch.id);
    for (let touchID of Selector.instance.touchIDsOverButtons) {
        if (!eventTouchIDs.includes(touchID)) Selector.instance.fire("removeTouchID", touchID);
    }
};