diff --git a/atlas/templates/atlas/collection_reset_answers_user_list.html b/atlas/templates/atlas/collection_reset_answers_user_list.html
index f2be051d..ecd48659 100644
--- a/atlas/templates/atlas/collection_reset_answers_user_list.html
+++ b/atlas/templates/atlas/collection_reset_answers_user_list.html
@@ -1,10 +1,14 @@
 
 {% for cid_user_exam in cid_users %}
+    {% if cid_user_exam.user_user and cid_user_exam.user_user.id %}
         <button class="btn btn-sm btn-primary" title="This will clear the user answers and attempts"
-        hx-post="{% url 'atlas:collection_reset_answers_user' collection.pk cid_user_exam.user_user.id %}"
-        hx-swap="outerHTML"
-        hx-confirm="Are you sure you want to reset answers for the user? This action cannot be undone."
-    >{{cid_user_exam.user_user}}</button>
-    
+            hx-post="{% url 'atlas:collection_reset_answers_user' collection.pk cid_user_exam.user_user.id %}"
+            hx-swap="outerHTML"
+            hx-confirm="Are you sure you want to reset answers for the user? This action cannot be undone."
+        >{{ cid_user_exam.user_user }}</button>
+    {% else %}
+        <button class="btn btn-sm btn-secondary" disabled>Unknown user</button>
+    {% endif %}
+
 {% endfor %}
     
\ No newline at end of file