diff --git a/src/frontend/src/components/core/folderSidebarComponent/components/sideBarFolderButtons/index.tsx b/src/frontend/src/components/core/folderSidebarComponent/components/sideBarFolderButtons/index.tsx
index de864b542b..e6fd188c95 100644
--- a/src/frontend/src/components/core/folderSidebarComponent/components/sideBarFolderButtons/index.tsx
+++ b/src/frontend/src/components/core/folderSidebarComponent/components/sideBarFolderButtons/index.tsx
@@ -168,7 +168,10 @@ const SideBarFoldersButtonsComponent = ({
                     console.error(err);
                     setErrorData({
                       title: t("sidebar.projectUploadError"),
-                      list: [err["response"]["data"]["message"]],
+                      list: [
+                        err?.response?.data?.detail ??
+                          (err instanceof Error ? err.message : String(err)),
+                      ],
                     });
                   },
                 },