diff --git a/src/AnonymizedFile.ts b/src/AnonymizedFile.ts
index 96a4a38..645e27f 100644
--- a/src/AnonymizedFile.ts
+++ b/src/AnonymizedFile.ts
@@ -192,7 +192,8 @@ export default class AnonymizedFile {
     try {
       await pipe(await this.anonymizedContent(), res);
     } catch (error) {
-      handleError(error, res);
+      handleError(error);
+      res.end();
     }
   }
 }
diff --git a/src/routes/route-utils.ts b/src/routes/route-utils.ts
index 0bc7c72..57cc8e6 100644
--- a/src/routes/route-utils.ts
+++ b/src/routes/route-utils.ts
@@ -62,7 +62,7 @@ function printError(error: any, req?: express.Request) {
 
 export function handleError(
   error: any,
-  res: express.Response,
+  res?: express.Response,
   req?: express.Request
 ) {
   printError(error, req);
@@ -78,8 +78,9 @@ export function handleError(
   } else if (message && message.indexOf("not_connected") > -1) {
     status = 401;
   }
-
-  res.status(status).send({ error: message });
+  if (res) {
+    res.status(status).send({ error: message });
+  }
   return;
 }