oh, that is wrong. you should use `this._sourceId` and remove that on disable.

Something like this? constructor() { this._sourceId = null; } disable() { if (this._sourceId) { GLib.Source.remove(this._sourceId); } this._sourceId.destroy(); this._sourceId = null; }

```js constructor() { this._sourceId = null; } enable() { let this._sourceId = GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 60, () => { // ... }); } disable() { if (this._sourceId) { GLib.Source.remove(this._sourceId); this._sourceId = null; } } ```

Sorry for that. I mean without `let`: ```js enable() { this._sourceId = GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 60, () => { } ```

I know ;) Thanks a lot for your support and patience!