Organic Groups integration errors

Hi,

I'm getting errors when using shoutbox in a organic group.
Submitting shouts with post method is ok.
On the other hand, submitting shouts in ajax mode produce a 500 error.

In both case (post or ajax), general page dedicated to shouts in a organic group is producing a 500 error :

• path = /shoutbox/group/[gid]
• Error message = EntityMalformedException: Missing bundle property on entity of type node. in entity_extract_ids()

My config is :

• Drupal 7 latest stable (7.43)
• Organic groups latest stable (7.x-2.9)
• Shoutbox (7.x-1.1)

Am i missing something ?

Thanks

ps : ajax submitting is fine when i'm not in a organic group context !