AfterLabelEdit on listView

I am tyring to use the afterLabelEdit for a listview and the problem I am having is that if you click on the row to enable an edit and then don't change anything I get the below error when getting the value via:

e.label.toString


An unhandled exception of type 'System.NullReferenceException' occurred in VliDotNet.exe

Additional information: Object reference not set to an instance of an object.

which I don't understand as if you actually edit the text then there is no problem!

Cheer
tim