JS error data.friendlist in colapsible block

Hi,

I insert IM Consol and IM Friend Picker block in "Mini Panel", and publish Mini Panel block in Home Page.

error javascript appears in my firebug console
ddata.friendlist_array.slice is not a function
http://mystite/sites/all/modules/im/im.js?x
Line 133

Why this Javascript error appears?

tanks