Sketch Crash on Populate With JSON when using SVG
It took me a few minutes to track down, but I am running into an issue where, if I use the SVG version of an icon, Sketch will crash upon clicking the "Populate" button. However, if I use a PNG version of the same icon, everything goes swimmingly. 

The SVG in question was originally generated by Sketch. I also attempted re-saving it from Illustrator as an SVG. And, then, exporting it from Illustrator as a web-optimized SVG. Same results. I also tried a few different SVG icons in case it was specific to one odd/corrupt file. Below is the actual SVG text of the SVG generated by Sketch:

`<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg width="21px" height="18px" viewBox="0 0 21 18" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 3.6.1 (26313) - http://www.bohemiancoding.com/sketch -->
    <title>icon_checkmark_green</title>
    <desc>Created with Sketch.</desc>
    <defs></defs>
    <g id="Response-States" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
        <g id="UI-Components" transform="translate(-532.000000, -50.000000)" fill="#5BB55D">
            <path d="M538.82094,67.1223958 L532,58.1380208 L535.024379,54.9479167 L538.82094,59.8307292 L550.725412,50 L552.205427,51.4973958 L538.82094,67.1223958 L538.82094,67.1223958 Z" id="icon_checkmark_green"></path>
        </g>
    </g>
</svg>`
