diff --git a/ui/src/e2e/new-session-page.e2e.test.ts b/ui/src/e2e/new-session-page.e2e.test.ts
index 145988299716..1f24fdf851cb 100644
--- a/ui/src/e2e/new-session-page.e2e.test.ts
+++ b/ui/src/e2e/new-session-page.e2e.test.ts
@@ -18,6 +18,8 @@ const describeControlUiE2e = chromiumAvailable || !allowMissingChromium ? descri
 
 const WORKSPACE = "/home/peter/openclaw";
 const PICKED = "/home/peter/openclaw/packages";
+const SOURCE_REPO = "/tmp/source-repo";
+const TARGET_REPO = "/tmp/target-repo";
 const NODE_HOME = "/Users/peter";
 const NODE_PICKED = "/Users/peter/Projects";
 const NODE_UNC = "\\\\server\\share\\repo";
@@ -174,6 +176,110 @@ describeControlUiE2e("Control UI new-session page mocked Gateway E2E", () => {
     }
   });
 
+  it("does not submit a previous repository's worktree base while branches load", async () => {
+    const context = await browser.newContext({
+      locale: "en-US",
+      serviceWorkers: "block",
+      viewport: { height: 900, width: 1280 },
+    });
+    const page = await context.newPage();
+    const gateway = await installMockGateway(page, {
+      workspaceGit: true,
+      methodResponses: {
+        "agents.list": {
+          agents: [
+            {
+              id: "main",
+              identity: { name: "Main" },
+              name: "Main",
+              workspace: SOURCE_REPO,
+              workspaceGit: true,
+            },
+          ],
+          defaultId: "main",
+          mainKey: "main",
+          scope: "agent",
+        },
+        "fs.listDir": {
+          cases: [
+            {
+              match: { path: SOURCE_REPO },
+              response: {
+                path: SOURCE_REPO,
+                parent: "/tmp",
+                home: "/home/peter",
+                entries: [],
+              },
+            },
+          ],
+        },
+        "worktrees.branches": {
+          cases: [
+            {
+              match: { repoRoot: SOURCE_REPO },
+              response: {
+                branches: [{ kind: "local", name: "alpha" }],
+                headBranch: "alpha",
+                repoRoot: SOURCE_REPO,
+              },
+            },
+            {
+              match: { repoRoot: TARGET_REPO },
+              response: {
+                branches: [{ kind: "local", name: "main" }],
+                headBranch: "main",
+                repoRoot: TARGET_REPO,
+              },
+            },
+          ],
+        },
+        "sessions.create": { key: "agent:main:repo-switch" },
+      },
+    });
+
+    try {
+      await page.goto(`${server.baseUrl}new`);
+      await gateway.waitForRequest("worktrees.branches");
+
+      const whereSelect = page.locator(
+        ".new-session-page__select:not(.new-session-page__select--folder)",
+      );
+      await whereSelect.locator("summary").click();
+      await page.getByRole("menuitemradio", { name: "Worktree" }).click();
+      const baseInput = page.getByLabel("Base branch");
+      await expect.poll(() => baseInput.inputValue()).toBe("alpha");
+      const branchRequestsBeforeSwitch = (await gateway.getRequests("worktrees.branches")).length;
+
+      await gateway.deferNext("worktrees.branches");
+      const folderSelect = page.locator(".new-session-page__select--folder");
+      await folderSelect.locator("summary").click();
+      await page
+        .locator(".new-session-page__browser-list")
+        .getByRole("button", { name: "Gateway" })
+        .click();
+      await page.locator("input.new-session-page__browser-path").fill(TARGET_REPO);
+      await page.getByRole("button", { name: "Use this folder" }).click();
+      await expect
+        .poll(async () => (await gateway.getRequests("worktrees.branches")).length)
+        .toBe(branchRequestsBeforeSwitch + 1);
+
+      expect(await baseInput.inputValue()).toBe("");
+      expect(await baseInput.getAttribute("placeholder")).toBe("Loading…");
+
+      await page.locator(".new-session-page__message").fill("use the selected repository");
+      await page.getByRole("button", { name: "Start session" }).click();
+      const create = await gateway.waitForRequest("sessions.create");
+      expect(create.params).toMatchObject({
+        cwd: TARGET_REPO,
+        worktree: true,
+      });
+      expect(create.params).not.toHaveProperty("worktreeBaseRef");
+      await gateway.resolveDeferred("worktrees.branches");
+    } finally {
+      await context.close();
+    }
+  });
+
   it("keeps a rejected first message visible and retryable after reload", async () => {
     const context = await browser.newContext({
       locale: "en-US",
diff --git a/ui/src/pages/new-session/new-session-page.ts b/ui/src/pages/new-session/new-session-page.ts
index 4967a92ec97d..c0359b2983ef 100644
--- a/ui/src/pages/new-session/new-session-page.ts
+++ b/ui/src/pages/new-session/new-session-page.ts
@@ -318,11 +318,13 @@ class NewSessionPage extends OpenClawLightDomElement {
   }
 
   private maybeLoadBranches() {
+    // Branch data belongs to one repository selection. Clear it before any
+    // exit or request so a previous repo's ref can never reach sessions.create.
+    const requestId = ++this.branchesRequestToken;
+    this.branches = null;
+    this.branchesLoading = false;
+    this.baseRef = "";
     if (this.execNode) {
-      this.branchesRequestToken += 1;
-      this.branches = null;
-      this.branchesLoading = false;
-      this.baseRef = "";
       return;
     }
     const repoRoot = this.folder.trim() || this.workspacePath();
@@ -336,7 +338,6 @@ class NewSessionPage extends OpenClawLightDomElement {
     if (!client) {
       return;
     }
-    const requestId = ++this.branchesRequestToken;
     this.branchesLoading = true;
     void client
       .request<DraftBranches>("worktrees.branches", { repoRoot })