diff --git a/src/components/BlockListPanel.tsx b/src/components/BlockListPanel.tsx
index 91d64da..573655c 100644
--- a/src/components/BlockListPanel.tsx
+++ b/src/components/BlockListPanel.tsx
@@ -27,7 +27,7 @@ export default function BlockListPanel({
     if (!q) return blocks;
     return blocks.filter(
       (b) =>
-        b.username.toLowerCase().includes(q) ||
+        (b.username || '').toLowerCase().includes(q) ||
         (b.display_name || '').toLowerCase().includes(q)
     );
   }, [blocks, search]);