1 files changed, 12 insertions, 8 deletions

diff --git a/src/internal-server/public/js/transfer.js b/src/internal-server/public/js/transfer.js
index 8382bba02..36fdbd61a 100644
--- a/src/internal-server/public/js/transfer.js
+++ b/src/internal-server/public/js/transfer.js
@@ -1,13 +1,17 @@
-const submitBtn = document.getElementById('submit');
-const fileInput = document.getElementById('file');
-const fileOutput = document.getElementById('fileoutput');
+const submitBtn = document.querySelector('#submit');
+const fileInput = document.querySelector('#file');
+const fileOutput = document.querySelector('#fileoutput');
 
-fileInput.addEventListener('change', () => {
+fileInput?.addEventListener('change', () => {
   const reader = new FileReader();
-  reader.onload = () => {
+  reader.addEventListener('load', () => {
     const text = reader.result;
-    fileOutput.value = text;
-    submitBtn.disabled = false;
-  };
+    if (fileOutput) {
+      fileOutput.value = text;
+    }
+    if (submitBtn) {
+      submitBtn.disabled = false;
+    }
+  });
   reader.readAsText(fileInput.files[0]);
 });