diff --git a/src/useEscKeyDown.ts b/src/useEscKeyDown.ts
index 79c022e..0044231 100644
--- a/src/useEscKeyDown.ts
+++ b/src/useEscKeyDown.ts
@@ -3,7 +3,7 @@ import { type EscCallback } from './Portal';
 import useId from '@rc-component/util/lib/hooks/useId';
 import { useEvent } from '@rc-component/util';
 
-let stack: string[] = [];
+export let stack: string[] = []; // export for testing
 
 export default function useEscKeyDown(open: boolean, onEsc?: EscCallback) {
   const id = useId();
@@ -31,6 +31,7 @@ export default function useEscKeyDown(open: boolean, onEsc?: EscCallback) {
     window.addEventListener('keydown', handleEscKeyDown);
 
     return () => {
+      stack = stack.filter(item => item !== id);
       window.removeEventListener('keydown', handleEscKeyDown);
     };
   }, [open, id]);
diff --git a/tests/index.test.tsx b/tests/index.test.tsx
index 72fa6a1..40b5eba 100644
--- a/tests/index.test.tsx
+++ b/tests/index.test.tsx
@@ -1,6 +1,7 @@
 import { render, fireEvent } from '@testing-library/react';
 import React from 'react';
 import Portal from '../src';
+import { stack } from '../src/useEscKeyDown';
 
 global.isOverflow = true;
 
@@ -355,5 +356,17 @@ describe('Portal', () => {
       );
       expect(onEscB).not.toHaveBeenCalled();
     });
+
+    it('should clear stack when unmount', () => {
+      const { unmount } = render(
+        <Portal open>
+          <div />
+        </Portal>,
+      );
+
+      expect(stack).toHaveLength(1);
+      unmount();
+      expect(stack).toHaveLength(0);
+    });
   });
 });