`croppie.destroy()` causes errors

Error 1

// This error happens because `opts.update()` is called after `destroy()`

Uncaught (in promise) TypeError: Cannot read property 'preview' of undefined
    at Croppie._get (webpack-internal:///223:1318:37)
    at Croppie._result (webpack-internal:///223:1353:25)
    at Croppie.result (webpack-internal:///223:1569:28)

Error 2

// This error happens because `_updateOverlay()` is triggered by `_debouncedOverlay()`
// after a `destroy()`, and `self.elements` is null

Uncaught TypeError: Cannot read property 'boundary' of undefined
    at Croppie._updateOverlay (croppie.js?f101:939)
    at later (croppie.js?f101:102)

function _updateOverlay() {
        var self = this,
            boundRect = self.elements.boundary.getBoundingClientRect(),
            imgData = self.elements.preview.getBoundingClientRect();
...
}

[ckmahoney]

I was encountering this because I had moved one of the Croppie components (the zoom slider) from the Croppie container into our container.

Calling destroy() with some Croppie elements intentionally placed elsewhere in the DOM threw an error. It looked like Croppie was trying to search for known children and couldn’t find them in the original parent container.

When I put the slider back into the original Croppie container, then proceed to can call destroy(), the instance is destroyed without error.

[thedustinsmith]

Good catch. I guess the simplest fix would be adding a

if (!self.elements) return;

at the top of the _updateOverlay.