diff --git a/shared/utils/files.test.ts b/shared/utils/files.test.ts
index 4555f0689..f0b2295e7 100644
--- a/shared/utils/files.test.ts
+++ b/shared/utils/files.test.ts
@@ -9,5 +9,6 @@ describe("bytesToHumanReadable", () => {
     expect(bytesToHumanReadable(12345)).toBe("12.34 kB");
     expect(bytesToHumanReadable(123456)).toBe("123.45 kB");
     expect(bytesToHumanReadable(1234567)).toBe("1.23 MB");
+    expect(bytesToHumanReadable(undefined)).toBe("0 Bytes");
   });
 });
diff --git a/shared/utils/files.ts b/shared/utils/files.ts
index efcb544f6..2484110e5 100644
--- a/shared/utils/files.ts
+++ b/shared/utils/files.ts
@@ -4,7 +4,11 @@
  * @param bytes filesize in bytes
  * @returns Human readable filesize as a string
  */
-export function bytesToHumanReadable(bytes: number) {
+export function bytesToHumanReadable(bytes: number | undefined) {
+  if (!bytes) {
+    return "0 Bytes";
+  }
+
   const out = ("0".repeat((bytes.toString().length * 2) % 3) + bytes).match(
     /.{3}/g
   );