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When a user follow or unfollow a post the commons_radioactivity_flag() function verify if the user is the owner of the content but in that function is used a undefined $node object causing "notice" errors.
As i understand should be necessary add a node_load using the $content_id before to use $node and in the conditions change the $node->nid and use $node->uid (for check the user).
I will provide a patch for fix this issue (if no one provide one before).