diff --git a/src/routes/research/[id]/+page.svelte b/src/routes/research/[id]/+page.svelte
index 51aa559..378630c 100644
--- a/src/routes/research/[id]/+page.svelte
+++ b/src/routes/research/[id]/+page.svelte
@@ -234,15 +234,17 @@
                     on:share={onShare}
                     on:revoke={onRevoke}
                 />
-                <button
-                    on:click={handleDelete}
-                    class="p-1.5 rounded text-gray-400 hover:text-red-500 hover:bg-red-50 dark:hover:bg-red-900/20 transition-colors"
-                    title="Löschen"
-                >
-                    <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
-                    </svg>
-                </button>
+                {#if statusText !== 'COMPLETED'}
+                    <button
+                        on:click={handleDelete}
+                        class="p-1.5 rounded text-gray-400 hover:text-red-500 hover:bg-red-50 dark:hover:bg-red-900/20 transition-colors"
+                        title="Löschen"
+                    >
+                        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
+                        </svg>
+                    </button>
+                {/if}
             </div>
         </div>
     </div>