diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index 9e143936..34b8b948 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -133,7 +133,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const current = await ensureWorkspace();
     if (!current) return false;
     const existing = visibleConversations.value.find((conversation) => conversation.conversationId === normalized) ?? null;
-    if (existing) {
+    if (existing && (existing.messages?.length ?? 0) > 0) {
       if (activeConversationId.value === normalized && messages.value.length > 0) return true;
       await selectConversation(existing);
       return activeConversationId.value === normalized;