diff --git a/swh/web/templates/includes/show-metadata.html b/swh/web/templates/includes/show-metadata.html
--- a/swh/web/templates/includes/show-metadata.html
+++ b/swh/web/templates/includes/show-metadata.html
@@ -37,10 +37,12 @@
       </button>
       <div class="dropdown-menu swh-extrinsic-metadata-menu">
         {% for swhid_info in swhids_info %}
-          <a href="{% url 'api-1-raw-extrinsic-metadata-swhid-authorities' swhid_info.swhid  %}" class="dropdown-item" role="button">
-            <i class="{{ swh_object_icons|key_value:swhid_info.object_type }} mdi-fw" aria-hidden="true"></i>
-            {{swhid_info.object_type}}
-          </a>
+          {% if swhid_info.swhid %}
+            <a href="{% url 'api-1-raw-extrinsic-metadata-swhid-authorities' swhid_info.swhid  %}" class="dropdown-item" role="button">
+              <i class="{{ swh_object_icons|key_value:swhid_info.object_type }} mdi-fw" aria-hidden="true"></i>
+              {{swhid_info.object_type}}
+            </a>
+          {% endif %}
         {% endfor %}
       </div>
     </div>