Hi,

here is an example: http://ift.tt/1AqaZEJ

How to reproduce:

- open fiddle

- select any cell in a grid

- scroll down to the bottom of the grid contetns

- celect another cell

in console you can see an error:

Uncaught TypeError: Cannot read property 'view' of null


sometimes you need to scroll from top to bottom and back to top again to see this error message.


also grid become slow when you have a large number of columns.