Invalid argument supplied for foreach() in interest group code

I am getting an invalid argument for foreach on the following line:
foreach($form_values['interest_groups_' . $list['id']] as $key => $group) {
which is around line 357 on the patched versions.

The temporary fix I did was to comment out the foreach because the client doesnt' have any interest groups. But this should be looked into.

	  /*
      foreach($form_values['interest_groups_' . $list['id']] as $key => $group) {
        $list['GROUPINGS'][] = array('id' => $key, 'groups' => is_array($group) ? implode(', ', array_filter($group)) : $group);
      }
	  */