diff --git a/src/routes/(angemeldet)/list/[vorgang]/+page.svelte b/src/routes/(angemeldet)/list/[vorgang]/+page.svelte
index 7f6b9aa..bd84376 100644
--- a/src/routes/(angemeldet)/list/[vorgang]/+page.svelte
+++ b/src/routes/(angemeldet)/list/[vorgang]/+page.svelte
@@ -139,6 +139,11 @@
 
 
 										if (!response.ok) {
+											if (response.status == 400) {
+												let json_res = await response.json()
+												alert(json_res['msg'])
+												return;
+											}
 											throw new Error(`Fehlgeschlagen: ${response.status}`)
 										} else {
 											setTimeout(() => {window.location.reload()}, 500)
diff --git a/src/routes/(angemeldet)/list/[vorgang]/+server.js b/src/routes/(angemeldet)/list/[vorgang]/+server.js
index e32d374..7b6efc0 100644
--- a/src/routes/(angemeldet)/list/[vorgang]/+server.js
+++ b/src/routes/(angemeldet)/list/[vorgang]/+server.js
@@ -11,10 +11,20 @@ export async function PUT({ request }) {
     // Vorgang
     let vorgang = request.url.split('/').at(-1)
 
-    // copy
+    // prepare copy, incl. check if new name exists already
     let old_name = data["old_name"]
     let src_full_path = `/tatort/${vorgang}/${old_name}`
     let new_name = `${vorgang}/${data["new_name"]}`
+
+    try {
+        let file_stats = await client.statObject('tatort', new_name)
+        return json({ msg: 'Die Datei existiert bereits.' }, { status: 400 })
+    } catch (error) {
+        // continue operation
+        console.log('continue operation')
+    }
+
+    // actual copy operation
     await client.copyObject('tatort', new_name, src_full_path)
 
     // delete