diff --git a/pages/api/file/uploadsinglefile.js b/pages/api/file/uploadsinglefile.js
index 42827762..a89d1961 100644
--- a/pages/api/file/uploadsinglefile.js
+++ b/pages/api/file/uploadsinglefile.js
@@ -10,7 +10,10 @@ import fs from "fs";
 import path from "path";
 
 const FILENAME_ALLOWED = /^[A-Za-z0-9 ._\-:()—']+$/;
-const MAX_FILES_PER_UPLOAD_BATCH = process.env.UPLOAD_BATCH_COUNT || 5;
+const MAX_FILES_PER_UPLOAD_BATCH = Math.max(
+    1,
+    Number.parseInt(process.env.UPLOAD_BATCH_COUNT || "5", 10) || 5
+);
 
 function validateFilenameServer(originalFilename) {
     const name = path.basename(originalFilename || "");