diff --git a/frontend/src/utils.test.ts b/frontend/src/utils.test.ts
index 897f2b8..69f8de6 100644
--- a/frontend/src/utils.test.ts
+++ b/frontend/src/utils.test.ts
@@ -43,7 +43,7 @@ describe("utils", () => {
 
     it("should handle null and undefined gracefully", () => {
       const result = cleanString(null);
-      expect(result).toBe(null);
+      expect(result).toBe("");
     });
   });
 
diff --git a/frontend/src/utils.ts b/frontend/src/utils.ts
index 58ecfe4..e3150c5 100644
--- a/frontend/src/utils.ts
+++ b/frontend/src/utils.ts
@@ -17,4 +17,4 @@ export const div = (a: number, b: number) => {
   return (a - a % b) / b;
 };
 
-export const cleanString = (s: string | null) => s?.trim()?.replaceAll(/\s{2,}/g, " ") ?? null;
\ No newline at end of file
+export const cleanString = (s: string | null) => s?.trim()?.replaceAll(/\s{2,}/g, " ") ?? "";
\ No newline at end of file