Javascript error for detailed navigation tree : 't' is undefined

Hi everybody,
I have a problem on my anonymous role. When i click on the link page of a km navigation IView in the detailed navigation tree, the IView open itself but the navigation tree disappear and i have a Javascript error :
Error : 't' is undefined.
Code : 0
URL : http://localhost:50000/irj/portal/anonymous?standAlone=true&buildTree=false&NavPathUpdate=false
Could somebody help me please ?

Sorry but it's the same result.
Anybody else?
Somebody could say me if i modify the parameter of the URL somewhere?
http://portal:50000/irj/portal/anonymous?standAlone=true&buildTree=false&NavPathUpdate=false&windowId=WID1182328037651
I talk about the parameter buildTree or NavPathUpdate.
These parameters are added when ai click on the link of the tree.

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