Uncaught TypeError: Cannot read property 'getHeight' of null

[postcasio]

With V4 enabled:

1. Click and hold on the minimap to start dragging.
2. Move the mouse down and outside the Atom window.
3. Release the mouse button outside the window.
4. Move the mouse back into the Atom window. The minimap continues to scroll when you move the mouse. (I expected this, since the minimap won't receive the mouseup event.) If you click in the editor at this point, the minimap goes back to normal and stops scrolling, but...
5. If you click on the minimap, it gets stuck in the scrolling state.
6. If you then close the editor, this error is thrown over and over again and Atom must be restarted.

Atom Version: 0.166.0
System: Mac OS X 10.10
Thrown From: minimap package, v3.5.0

Stack Trace

Uncaught TypeError: Cannot read property 'getHeight' of null

At /Users/dominic/.atom/packages/minimap/lib/minimap.coffee:86

TypeError: Cannot read property 'getHeight' of null
  at Minimap.module.exports.Minimap.getVisibleHeight (/Users/dominic/.atom/packages/minimap/lib/minimap.coffee:86:25)
  at atom-text-editor-minimap.MinimapElement.drag (/Users/dominic/.atom/packages/minimap/lib/minimap-element.coffee:379:27)
  at HTMLBodyElement.<anonymous> (/Users/dominic/.atom/packages/minimap/lib/minimap-element.coffee:366:32)

[abe33]

Nice catch @postcasio 👍, I'll make sure to fix that for the next patch.