diff --git a/src/routes/idaa/(idaa)/bb/+page.svelte b/src/routes/idaa/(idaa)/bb/+page.svelte
index bcf63ed4..a28569d4 100644
--- a/src/routes/idaa/(idaa)/bb/+page.svelte
+++ b/src/routes/idaa/(idaa)/bb/+page.svelte
@@ -72,9 +72,10 @@
                 .toArray();
 
             // SORT: Most recently updated or created at the top (Refactored 2026-02-05)
+            // ROBUSTNESS: Ensure fallback to 0 to prevent NaN comparison issues
             results.sort((a, b) => {
-                const date_a = new Date(a.updated_on ?? a.created_on).getTime();
-                const date_b = new Date(b.updated_on ?? b.created_on).getTime();
+                const date_a = new Date(a.updated_on ?? a.created_on ?? 0).getTime() || 0;
+                const date_b = new Date(b.updated_on ?? b.created_on ?? 0).getTime() || 0;
                 return date_b - date_a;
             });