diff --git a/app/templates/qualys_agents.html b/app/templates/qualys_agents.html
index 11d0185..96a2e82 100644
--- a/app/templates/qualys_agents.html
+++ b/app/templates/qualys_agents.html
@@ -133,7 +133,7 @@
             <td class="p-2 font-mono text-cyber-accent">{{ a.hostname }}</td>
             <td class="p-2 text-center text-gray-400">{{ a.os or '-' }}</td>
             <td class="p-2 text-center font-mono">{{ a.agent_version or '-' }}</td>
-            <td class="p-2 text-center text-cyber-yellow">{{ a.last_checkin[:10] if a.last_checkin else '-' }}</td>
+            <td class="p-2 text-center text-cyber-yellow">{% if a.last_checkin %}{{ (a.last_checkin|string)[:10] }}{% else %}-{% endif %}</td>
             <td class="p-2 text-center">{{ a.etat or '-' }}</td>
         </tr>
         {% endfor %}