diff --git a/src/bundle/Resources/views/themes/admin/user/role_assignment/create.html.twig b/src/bundle/Resources/views/themes/admin/user/role_assignment/create.html.twig
index 415732aa15..03ff01eeaa 100644
--- a/src/bundle/Resources/views/themes/admin/user/role_assignment/create.html.twig
+++ b/src/bundle/Resources/views/themes/admin/user/role_assignment/create.html.twig
@@ -34,9 +34,9 @@
                                 id: user.content.versionInfo.contentInfo.id,
                                 name: ibexa_content_name(user)
                             }) %}
-                            {% set items_map = form.users.vars.data|reduce((output, user) => output|merge({
-                                "{{user.content.versionInfo.contentInfo.id}}": user.id
-                            }), {}) %}
+                            {% set items_map = form.users.vars.data|reduce((output, user) => output + {
+                                (user.id): user.content.versionInfo.contentInfo.mainLocationId,
+                            }, {}) %}
                             {% set users_udw_title = "role_assignment.view.add.panel.users_and_groups.users.udw_title"
                                 |trans({}, 'ibexa_role')
                                 |desc("Select Users to assign to the Role") %}
@@ -66,9 +66,9 @@
                                 id: group.content.versionInfo.contentInfo.id,
                                 name: ibexa_content_name(group.content)
                             }) %}
-                            {% set items_map = form.groups.vars.data|reduce((output, group) => output|merge({
-                                "{{group.content.versionInfo.contentInfo.i}}": group.id
-                            }), {}) %}
+                            {% set items_map = form.groups.vars.data|reduce((output, group) => output + {
+                                (group.id): group.content.versionInfo.contentInfo.mainLocationId,
+                            }, {}) %}
                             {% set groups_udw_title = "role_assignment.view.add.panel.users_and_groups.groups.udw_title"
                                 |trans({}, 'ibexa_role')
                                 |desc("Select User Groups to assign to the Role") %}