Duplicate row group key

[Wesley]

I'm having an issue where I sometimes get two groups with a key of empty string when I add a grouping to my data.

It's really important that these group keys be unique because I'm doing some fairly complicated grid navigation in hierarchical grids and I rely on that key being unique so I can programatically make decisions about where to move focus.

Is there a grouping maximum or something that I'm missing, or is this a Telerik bug?

[Wesley]

I figured the issue out. One of the keys is null and the other is empty string.