diff --git a/addons/portal/wizard/share_wizard.py b/addons/portal/wizard/share_wizard.py
index b5c9d165cc6..7d84270bd5b 100644
--- a/addons/portal/wizard/share_wizard.py
+++ b/addons/portal/wizard/share_wizard.py
@@ -114,7 +114,7 @@ class share_wizard_portal(osv.osv_memory):
         # In both cases, we call super() to create the share group, but when
         # sharing with existing groups, we will later delete it, and copy its
         # access rights and rules to the selected groups.
-        group_id = super(share_wizard_portal,self)._create_share_users_group(cr, uid, wizard_data, context=context)
+        super_result = super(share_wizard_portal,self)._create_share_users_group(cr, uid, wizard_data, context=context)
 
         # For sharing with existing groups, we don't create a share group, instead we'll
         # alter the rules of the groups so they can see the shared data
@@ -137,10 +137,10 @@ class share_wizard_portal(osv.osv_memory):
                     wizard_data.write({'result_line_ids': [(0,0,new_line)]})
 
         elif wizard_data.user_ids:
-            # must take care of existing users, by adding them to the new group, which is group_ids[0],
+            # must take care of existing users, by adding them to the new group, which is super_result[0],
             # and adding the shortcut
             selected_user_ids = [x.id for x in wizard_data.user_ids]
-            self.pool.get('res.users').write(cr, UID_ROOT, selected_user_ids, {'groups_id': [(4,group_id)]})
+            self.pool.get('res.users').write(cr, UID_ROOT, selected_user_ids, {'groups_id': [(4, super_result[0])]})
             self._setup_action_and_shortcut(cr, uid, wizard_data, selected_user_ids, make_home=False, context=context)
             # populate the result lines for existing users too
             for user in wizard_data.user_ids:
@@ -148,7 +148,7 @@ class share_wizard_portal(osv.osv_memory):
                              'newly_created': False}
                 wizard_data.write({'result_line_ids': [(0,0,new_line)]})
 
-        return group_id
+        return super_result
 
     def copy_share_group_access_and_delete(self, cr, wizard_data, share_group_id, context=None):
         # In the case of sharing with existing groups, the strategy is to copy
diff --git a/addons/share/wizard/share_wizard.py b/addons/share/wizard/share_wizard.py
index 07004f333a8..b0b6a06a0cb 100644
--- a/addons/share/wizard/share_wizard.py
+++ b/addons/share/wizard/share_wizard.py
@@ -668,7 +668,8 @@ class share_wizard(osv.osv_memory):
         """Creates the appropriate share group and share users, and populates
            result_line_ids of wizard_data with one line for each user.
 
-           :return: the new group id (to which the shared access should be granted)
+           :return: a tuple composed of the new group id (to which the shared access should be granted),
+                the ids of the new share users that have been created and the ids of the existing share users
         """
         group_id = self._create_share_group(cr, uid, wizard_data, context=context)
         # First create any missing user, based on the email addresses provided
@@ -739,7 +740,7 @@ class share_wizard(osv.osv_memory):
         all_relations = obj0 + obj1 + obj2
         self._link_or_copy_current_user_rules(cr, current_user, group_id, all_relations, context=context)
         # B.
-        main_domain = wizard_data.domain if wizard_data.domain != '[]' else DOMAIN_ALL
+        main_domain = wizard_data.domain if wizard_data.domain != '[]' else str(DOMAIN_ALL)
         self._create_or_combine_sharing_rule(cr, current_user, wizard_data,
                      group_id, model_id=model.id, domain=main_domain,
                      restrict=True, context=context)