Cannot download images on Firefox

[anastarawneh]

I'm getting this error in the console whenever I try to download an image:

Uncaught TypeError: FileReader.readAsDataURL: Argument 1 is not an object.
    h dom-to-image.js:506
    _rollbar_wrapped rollbar.umd.min.js:1
    n rollbar.umd.min.js:2
    instrumentNetwork rollbar.umd.min.js:2
    r dom-to-image.js:478
    getAndEncode dom-to-image.js:437
    promise callback*o dom-to-image.js:594
    n dom-to-image.js:615
    promise callback*42393/inlineAll/o</< dom-to-image.js:614
    o dom-to-image.js:612
    promise callback*inlineAll dom-to-image.js:610
    i dom-to-image.js:732
    t dom-to-image.js:717
    m dom-to-image.js:294
    promise callback*s dom-to-image.js:50
    l dom-to-image.js:132
    toPng dom-to-image.js:87
    toImage Result.tsx:201
    s Result.tsx:4
    promise callback*l Result.tsx:6
    x Result.tsx:7
    x Result.tsx:3
    toImage Result.tsx:193
    onClickDownload Result.tsx:265
    React 11
    unstable_runWithPriority scheduler.production.min.js:19
    React 3
    _rollbar_wrapped rollbar.umd.min.js:1
    o rollbar.umd.min.js:2
    xr React
dom-to-image.js:506:24

Everything works just fine on Edge, I'm only seeing this issue on Firefox.