diff --git a/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts b/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts
index cfef3323..4526f7e3 100644
--- a/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts
+++ b/web/hwlab-cloud-web/scripts/r6-architecture-parity.test.ts
@@ -67,6 +67,12 @@ test("R6 console semantics keep real icons, native entity lists, and dynamic acc
   const accessSource = read("src/components/access/AccessMatrixPanel.vue");
   assert.match(accessSource, /--permission-tool-count/u);
   assert.doesNotMatch(accessSource, /repeat\(6,/u);
+  assert.match(accessSource, /if \(!value\) access\.clearSelection\(\)/u);
+  assert.match(accessSource, /function closeInspector\(\): void \{ access\.clearSelection\(\);/u);
+  const accessStoreSource = read("src/stores/access.ts");
+  assert.match(accessStoreSource, /function clearSelection\(\): void/u);
+  assert.match(accessStoreSource, /selectedUserId\.value = null/u);
+  assert.match(accessStoreSource, /detail\.value = null/u);
 });
 
 test("R6 Sub2API source comparison is recorded in parent/child issue scope", () => {
diff --git a/web/hwlab-cloud-web/src/components/access/AccessMatrixPanel.vue b/web/hwlab-cloud-web/src/components/access/AccessMatrixPanel.vue
index 58fc4002..1382c342 100644
--- a/web/hwlab-cloud-web/src/components/access/AccessMatrixPanel.vue
+++ b/web/hwlab-cloud-web/src/components/access/AccessMatrixPanel.vue
@@ -48,13 +48,14 @@ onMounted(async () => {
 watch(() => route.params.userId, (userId) => {
   const value = typeof userId === "string" ? userId : "";
   if (value && value !== access.selectedUserId) void access.selectUser(value);
+  if (!value) access.clearSelection();
 });
 
 function selectRow(row: AccessUserRow): void {
   if (route.params.userId !== row.id) void router.push({ name: "AccessUserDetail", params: { userId: row.id }, query: route.query });
   void access.selectUser(row.id);
 }
-function closeInspector(): void { void router.push({ name: "Access", query: route.query }); }
+function closeInspector(): void { access.clearSelection(); void router.push({ name: "Access", query: route.query }); }
 function onRoleChange(event: Event): void { const role = (event.target as HTMLSelectElement).value as AccessUserRole; void access.updateSelectedUser({ role }); }
 function onStatusChange(event: Event): void { const status = (event.target as HTMLSelectElement).value as AccessUserStatus; void access.updateSelectedUser({ status }); }
 function onToolChange(toolId: string, event: Event): void { void access.setTool(toolId, (event.target as HTMLInputElement).checked); }
diff --git a/web/hwlab-cloud-web/src/stores/access.test.ts b/web/hwlab-cloud-web/src/stores/access.test.ts
new file mode 100644
index 00000000..911ad4fb
--- /dev/null
+++ b/web/hwlab-cloud-web/src/stores/access.test.ts
@@ -0,0 +1,37 @@
+import { createPinia, setActivePinia } from "pinia";
+import { beforeEach, expect, test, vi } from "vitest";
+
+const { userRequest } = vi.hoisted(() => ({ userRequest: vi.fn() }));
+
+vi.mock("@/api", () => ({
+  accessAPI: {
+    summary: vi.fn(),
+    users: vi.fn(),
+    user: userRequest,
+    updateUser: vi.fn(),
+    setTool: vi.fn()
+  }
+}));
+
+import { useAccessStore } from "./access";
+
+beforeEach(() => {
+  setActivePinia(createPinia());
+  userRequest.mockReset();
+});
+
+test("clearSelection ignores a stale detail response", async () => {
+  let resolveRequest: (value: { ok: true; status: number; data: { user?: { id: string } } }) => void = () => undefined;
+  userRequest.mockReturnValue(new Promise((resolve) => { resolveRequest = resolve; }));
+  const store = useAccessStore();
+
+  const pending = store.selectUser("user-a");
+  store.clearSelection();
+  resolveRequest({ ok: true, status: 200, data: { user: { id: "user-a" } } });
+  await pending;
+
+  expect(store.selectedUserId).toBeNull();
+  expect(store.detail).toBeNull();
+  expect(store.selectedUser).toBeNull();
+  expect(store.detailLoading).toBe(false);
+});
diff --git a/web/hwlab-cloud-web/src/stores/access.ts b/web/hwlab-cloud-web/src/stores/access.ts
index 261e26cd..97c1228f 100644
--- a/web/hwlab-cloud-web/src/stores/access.ts
+++ b/web/hwlab-cloud-web/src/stores/access.ts
@@ -37,6 +37,7 @@ export const useAccessStore = defineStore("access", () => {
     detailLoading.value = true;
     mutationError.value = null;
     const response = await accessAPI.user(userId);
+    if (selectedUserId.value !== userId) return;
     if (response.ok) {
       detail.value = response.data;
     } else {
@@ -45,6 +46,14 @@ export const useAccessStore = defineStore("access", () => {
     detailLoading.value = false;
   }
 
+  function clearSelection(): void {
+    selectedUserId.value = null;
+    detail.value = null;
+    detailLoading.value = false;
+    savingKey.value = null;
+    mutationError.value = null;
+  }
+
   async function updateSelectedUser(payload: { role?: AccessUserRole; status?: AccessUserStatus }): Promise<void> {
     if (!selectedUserId.value) return;
     savingKey.value = `user:${selectedUserId.value}`;
@@ -75,5 +84,5 @@ export const useAccessStore = defineStore("access", () => {
     savingKey.value = null;
   }
 
-  return { summary, users, detail, selectedUserId, summaryView, userRows, detailView, toolRows, selectedUser, loading, detailLoading, savingKey, error, mutationError, refresh, selectUser, updateSelectedUser, setTool };
+  return { summary, users, detail, selectedUserId, summaryView, userRows, detailView, toolRows, selectedUser, loading, detailLoading, savingKey, error, mutationError, refresh, selectUser, clearSelection, updateSelectedUser, setTool };
 });