LcShopBundle/ShopBundle/Resources/views/backend/default/field/user.html.twig

{% if item is defined and item.user is defined and item.user is not null %}
    <a href="{{ path('easyadmin', {"entity": 'User', 'action': "show", "id" : item.user.id})}}">{{ value }}</a>
{% elseif user is defined and user is not null %}
    <a href="{{ path('easyadmin', {"entity": 'User', 'action': "show", "id" : user.id})}}">{{ user }}</a>
{% else %}
    {{ value }}
{% endif %}