After some more digging I found that all that lacks is a configured "rootPath" 
in the tree definition.

So just in case someone else is stuck with this:
Go to config > modules > adminInterface > trees > users 
and add a node data with "rootPath" (name) and "/" (value)

that fixed the issue for me.





On 08.06.2012, at 23:06, Thomas Martin wrote:

> Dear List 
> 
> While trying to adjust a role (adding a user) I stumbled on what seems to be 
> a bug:
> 
> If you open the edit role dialog under security, switch to ACL, select the 
> "Users" reposoitory from the dropdown and click on "choose"  you'll see a 
> NullPointerException.
> 
> I've tried this on several instances and even the 
> http://demoauthor.magnolia-cms.com/ seems to be affected by this.
> Checking older projects I can see the issue was not around in 4.4.2, at least 
> since 4.4.6 this seems to be an issue.
> 
> Can others confirm this misbehavior? 
> And is there some solution to this?
> 
> Any advice is much appreciated!
> 
> Thanks & best regards
> Thomas
> 
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