diff --git a/frontend/src/app/knowledge/chunks/page.tsx b/frontend/src/app/knowledge/chunks/page.tsx
index 9a889dae..c55690c5 100644
--- a/frontend/src/app/knowledge/chunks/page.tsx
+++ b/frontend/src/app/knowledge/chunks/page.tsx
@@ -26,6 +26,7 @@ const getFileTypeLabel = (mimetype: string) => {
   if (mimetype === "application/pdf") return "PDF";
   if (mimetype === "text/plain") return "Text";
   if (mimetype === "application/msword") return "Word Document";
+  return "Unknown";
 };
 
 function ChunksPageContent() {