diff --git a/controller/internal/web/templates/monitoring.html b/controller/internal/web/templates/monitoring.html
index 5b78bee..6a175c0 100644
--- a/controller/internal/web/templates/monitoring.html
+++ b/controller/internal/web/templates/monitoring.html
@@ -532,7 +532,7 @@
         try {
             var resp = await fetch('/api/system/info');
             var json = await resp.json();
-            if (json.ok && json.data) usedMB = json.data.used_mem_mb || 0;
+            if (json.ok && json.data && json.data.system) usedMB = json.data.system.used_mem_mb || 0;
         } catch(e) {}
         if (!usedMB) return;