<p><a href="https://github.com/harry-wood" class="user-mention">@harry-wood</a> reported this on IRC and I just confirmed it. Getting the following error:</p>

<pre><code>Uncaught TypeError: Cannot call method 'getBoundingClientRect' of undefined application-a6d7d6936b94d13540851a8cf8de17e2.js:37
i.DomEvent.getMousePosition application-a6d7d6936b94d13540851a8cf8de17e2.js:37
L.Control.extend._onSliderClick application-a6d7d6936b94d13540851a8cf8de17e2.js:48
e.(anonymous function).o
</code></pre>

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