diff --git a/ui/src/ui/controllers/control-ui-bootstrap.test.ts b/ui/src/ui/controllers/control-ui-bootstrap.test.ts
index 7efe0b09b6..29e66fab85 100644
--- a/ui/src/ui/controllers/control-ui-bootstrap.test.ts
+++ b/ui/src/ui/controllers/control-ui-bootstrap.test.ts
@@ -58,4 +58,25 @@ describe("loadControlUiBootstrapConfig", () => {
 
     vi.unstubAllGlobals();
   });
+
+  it("normalizes trailing slash basePath for bootstrap fetch path", async () => {
+    const fetchMock = vi.fn().mockResolvedValue({ ok: false });
+    vi.stubGlobal("fetch", fetchMock as unknown as typeof fetch);
+
+    const state = {
+      basePath: "/openclaw/",
+      assistantName: "Assistant",
+      assistantAvatar: null,
+      assistantAgentId: null,
+    };
+
+    await loadControlUiBootstrapConfig(state);
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      `/openclaw${CONTROL_UI_BOOTSTRAP_CONFIG_PATH}`,
+      expect.objectContaining({ method: "GET" }),
+    );
+
+    vi.unstubAllGlobals();
+  });
 });