diff --git a/frontend/src/api/files.js b/frontend/src/api/files.js
index 5942e71a..b3177c9d 100644
--- a/frontend/src/api/files.js
+++ b/frontend/src/api/files.js
@@ -43,7 +43,7 @@ async function resourceAction (url, method, content) {
   const res = await fetchURL(`/api/resources${url}`, opts)
 
   if (res.status !== 200) {
-    throw new Error(res.responseText)
+    throw new Error(await res.text())
   } else {
     return res
   }