diff --git a/assets/script.js b/assets/script.js
index f5482fd..fce9d3a 100644
--- a/assets/script.js
+++ b/assets/script.js
@@ -12,6 +12,16 @@ function isLoggedIn() {
     return UserInfo.Email && 0 < UserInfo.Email.length;
 }
 
+function until(conditionFunction) {
+
+    const poll = resolve => {
+        if(conditionFunction()) resolve();
+        else setTimeout(_ => poll(resolve), 400);
+    }
+
+    return new Promise(poll);
+}
+
 async function handleResponse(data, successMessage, failureMessage) {
     "use strict";
     const statusMessageContainer = document.getElementById("statusMessageContainer");
@@ -594,7 +604,7 @@ async function getFileList() {
         }
     };
     xhr.send(formData);
-    while (tmp === undefined);
+    until(_ => (tmp !== undefined));
     return tmp;
 }