diff --git a/examples/dynamic-options.jsx b/examples/dynamic-options.jsx
index 8c1c2872..9cc98769 100644
--- a/examples/dynamic-options.jsx
+++ b/examples/dynamic-options.jsx
@@ -40,6 +40,7 @@ class Demo extends React.Component {
         {
           label: `${targetOption.label}动态加载1`,
           value: 'dynamic1',
+          isLeaf: false,
         },
         {
           label: `${targetOption.label}动态加载2`,
@@ -50,7 +51,7 @@ class Demo extends React.Component {
         // eslint-disable-next-line react/no-access-state-in-setstate
         options: [...this.state.options],
       });
-    }, 1000);
+    }, 500);
   };
 
   render() {
diff --git a/src/OptionList/index.tsx b/src/OptionList/index.tsx
index 11df8ba6..cb93fe86 100644
--- a/src/OptionList/index.tsx
+++ b/src/OptionList/index.tsx
@@ -53,7 +53,7 @@ const RefOptionList = React.forwardRef<RefOptionListProps, OptionListProps>((pro
       const { options: optionList } = restoreCompatibleValue(entity as any, fieldNames);
       const rawOptionList = optionList.map(opt => opt.node);
 
-      setLoadingKeys(keys => [...keys, optionList[optionList.length - 1].value]);
+      setLoadingKeys(keys => [...keys, entity.key]);
 
       loadData(rawOptionList);
     }
@@ -64,7 +64,7 @@ const RefOptionList = React.forwardRef<RefOptionListProps, OptionListProps>((pro
     if (loadingKeys.length) {
       loadingKeys.forEach(loadingKey => {
         const option = flattenOptions.find(opt => opt.value === loadingKey);
-        if (option.data.children || option.data.isLeaf === true) {
+        if (!option || option.data.children || option.data.isLeaf === true) {
           setLoadingKeys(keys => keys.filter(key => key !== loadingKey));
         }
       });
diff --git a/tests/index.spec.tsx b/tests/index.spec.tsx
index 54b2a66b..b1f4c84d 100644
--- a/tests/index.spec.tsx
+++ b/tests/index.spec.tsx
@@ -1,7 +1,6 @@
 /* eslint-disable react/jsx-no-bind */
 
 import React from 'react';
-import { act } from 'react-dom/test-utils';
 import { resetWarned } from 'rc-util/lib/warning';
 import { spyElementPrototypes } from 'rc-util/lib/test/domHook';
 import { mount } from './enzyme';
@@ -511,136 +510,6 @@ describe('Cascader.Basic', () => {
     expect(wrapper.isOpen()).toBeFalsy();
   });
 
-  describe('loadData', () => {
-    it('basic load', () => {
-      const loadData = jest.fn();
-      const wrapper = mount(
-        <Cascader
-          loadingIcon={<div className="loading-icon" />}
-          options={[
-            {
-              label: 'Bamboo',
-              value: 'bamboo',
-              isLeaf: false,
-            },
-          ]}
-          loadData={loadData}
-          open
-        />,
-      );
-
-      wrapper.find('.rc-cascader-menu-item-content').first().simulate('click');
-      expect(wrapper.exists('.loading-icon')).toBeTruthy();
-      expect(loadData).toHaveBeenCalledWith([
-        expect.objectContaining({
-          value: 'bamboo',
-        }),
-      ]);
-
-      expect(wrapper.exists('.rc-cascader-menu-item-loading')).toBeTruthy();
-      expect(wrapper.exists('.rc-cascader-menu-item-loading-icon')).toBeTruthy();
-
-      // Fill data
-      wrapper.setProps({
-        options: [
-          {
-            label: 'Bamboo',
-            value: 'bamboo',
-            isLeaf: false,
-            children: [],
-          },
-        ],
-      });
-      wrapper.update();
-      expect(wrapper.exists('.loading-icon')).toBeFalsy();
-    });
-
-    it('not load leaf', () => {
-      const loadData = jest.fn();
-      const onValueChange = jest.fn();
-      const wrapper = mount(
-        <Cascader
-          open
-          loadData={loadData}
-          onChange={onValueChange}
-          options={[
-            {
-              label: 'Light',
-              value: 'light',
-            },
-          ]}
-        />,
-      );
-
-      wrapper.clickOption(0, 0);
-      expect(onValueChange).toHaveBeenCalled();
-      expect(loadData).not.toHaveBeenCalled();
-    });
-
-    // https://github.com/ant-design/ant-design/issues/9084
-    it('should trigger loadData when expandTrigger is hover', () => {
-      const options = [
-        {
-          value: 'zhejiang',
-          label: 'Zhejiang',
-          isLeaf: false,
-        },
-        {
-          value: 'jiangsu',
-          label: 'Jiangsu',
-          isLeaf: false,
-        },
-      ];
-      const loadData = jest.fn();
-      const wrapper = mount(
-        <Cascader options={options} loadData={loadData} changeOnSelect expandTrigger="hover">
-          <input readOnly />
-        </Cascader>,
-      );
-      wrapper.find('input').simulate('click');
-      const menus = wrapper.find('.rc-cascader-menu');
-      const menu1Items = menus.at(0).find('.rc-cascader-menu-item');
-      menu1Items.at(0).simulate('mouseEnter');
-      jest.runAllTimers();
-      expect(loadData).toHaveBeenCalled();
-    });
-
-    it('change isLeaf back to true should not loop loading', async () => {
-      const Demo = () => {
-        const [options, setOptions] = React.useState([
-          { value: 'zhejiang', label: 'Zhejiang', isLeaf: false },
-        ]);
-
-        const loadData = () => {
-          Promise.resolve().then(() => {
-            act(() => {
-              setOptions([
-                {
-                  value: 'zhejiang',
-                  label: 'Zhejiang',
-                  isLeaf: true,
-                },
-              ]);
-            });
-          });
-        };
-
-        return <Cascader options={options} loadData={loadData} open />;
-      };
-
-      const wrapper = mount(<Demo />);
-      wrapper.find('.rc-cascader-menu-item-content').first().simulate('click');
-      expect(wrapper.exists('.rc-cascader-menu-item-loading')).toBeTruthy();
-
-      for (let i = 0; i < 3; i += 1) {
-        await Promise.resolve();
-      }
-      wrapper.update();
-
-      expect(wrapper.exists('.rc-cascader-menu-item-loading')).toBeFalsy();
-    });
-  });
-
   // https://github.com/ant-design/ant-design/issues/9793
   it('should not trigger onBlur and onFocus when select item', () => {
     // This function is handled by `rc-select` instead
diff --git a/tests/loadData.spec.tsx b/tests/loadData.spec.tsx
new file mode 100644
index 00000000..e7bb5522
--- /dev/null
+++ b/tests/loadData.spec.tsx
@@ -0,0 +1,185 @@
+/* eslint-disable react/jsx-no-bind */
+
+import React from 'react';
+import { act } from 'react-dom/test-utils';
+import { mount } from './enzyme';
+import Cascader from '../src';
+
+describe('Cascader.LoadData', () => {
+  beforeEach(() => {
+    jest.useFakeTimers();
+  });
+
+  afterEach(() => {
+    jest.useRealTimers();
+  });
+
+  it('basic load', () => {
+    const loadData = jest.fn();
+    const wrapper = mount(
+      <Cascader
+        loadingIcon={<div className="loading-icon" />}
+        options={[
+          {
+            label: 'Bamboo',
+            value: 'bamboo',
+            isLeaf: false,
+          },
+        ]}
+        loadData={loadData}
+        open
+      />,
+    );
+
+    wrapper.find('.rc-cascader-menu-item-content').first().simulate('click');
+    expect(wrapper.exists('.loading-icon')).toBeTruthy();
+    expect(loadData).toHaveBeenCalledWith([
+      expect.objectContaining({
+        value: 'bamboo',
+      }),
+    ]);
+
+    expect(wrapper.exists('.rc-cascader-menu-item-loading')).toBeTruthy();
+    expect(wrapper.exists('.rc-cascader-menu-item-loading-icon')).toBeTruthy();
+
+    // Fill data
+    wrapper.setProps({
+      options: [
+        {
+          label: 'Bamboo',
+          value: 'bamboo',
+          isLeaf: false,
+          children: [],
+        },
+      ],
+    });
+    wrapper.update();
+    expect(wrapper.exists('.loading-icon')).toBeFalsy();
+  });
+
+  it('not load leaf', () => {
+    const loadData = jest.fn();
+    const onValueChange = jest.fn();
+    const wrapper = mount(
+      <Cascader
+        open
+        loadData={loadData}
+        onChange={onValueChange}
+        options={[
+          {
+            label: 'Light',
+            value: 'light',
+          },
+        ]}
+      />,
+    );
+
+    wrapper.clickOption(0, 0);
+    expect(onValueChange).toHaveBeenCalled();
+    expect(loadData).not.toHaveBeenCalled();
+  });
+
+  // https://github.com/ant-design/ant-design/issues/9084
+  it('should trigger loadData when expandTrigger is hover', () => {
+    const options = [
+      {
+        value: 'zhejiang',
+        label: 'Zhejiang',
+        isLeaf: false,
+      },
+      {
+        value: 'jiangsu',
+        label: 'Jiangsu',
+        isLeaf: false,
+      },
+    ];
+    const loadData = jest.fn();
+    const wrapper = mount(
+      <Cascader options={options} loadData={loadData} changeOnSelect expandTrigger="hover">
+        <input readOnly />
+      </Cascader>,
+    );
+    wrapper.find('input').simulate('click');
+    const menus = wrapper.find('.rc-cascader-menu');
+    const menu1Items = menus.at(0).find('.rc-cascader-menu-item');
+    menu1Items.at(0).simulate('mouseEnter');
+    jest.runAllTimers();
+    expect(loadData).toHaveBeenCalled();
+  });
+
+  it('change isLeaf back to true should not loop loading', async () => {
+    const Demo = () => {
+      const [options, setOptions] = React.useState([
+        { value: 'zhejiang', label: 'Zhejiang', isLeaf: false },
+      ]);
+
+      const loadData = () => {
+        Promise.resolve().then(() => {
+          act(() => {
+            setOptions([
+              {
+                value: 'zhejiang',
+                label: 'Zhejiang',
+                isLeaf: true,
+              },
+            ]);
+          });
+        });
+      };
+
+      return <Cascader options={options} loadData={loadData} open />;
+    };
+
+    const wrapper = mount(<Demo />);
+    wrapper.find('.rc-cascader-menu-item-content').first().simulate('click');
+    expect(wrapper.exists('.rc-cascader-menu-item-loading')).toBeTruthy();
+
+    for (let i = 0; i < 3; i += 1) {
+      await Promise.resolve();
+    }
+    wrapper.update();
+
+    expect(wrapper.exists('.rc-cascader-menu-item-loading')).toBeFalsy();
+  });
+
+  it('nest load should not crash', async () => {
+    const Demo = () => {
+      const [options, setOptions] = React.useState([{ label: 'top', value: 'top', isLeaf: false }]);
+
+      const loadData = selectedOptions => {
+        Promise.resolve().then(() => {
+          act(() => {
+            selectedOptions[selectedOptions.length - 1].children = [
+              {
+                label: 'child',
+                value: 'child',
+                isLeaf: false,
+              },
+            ];
+            setOptions(list => [...list]);
+          });
+        });
+      };
+
+      return <Cascader options={options} loadData={loadData} open />;
+    };
+
+    const wrapper = mount(<Demo />);
+
+    // First column click
+    wrapper.find('.rc-cascader-menu-item-content').last().simulate('click');
+    for (let i = 0; i < 3; i += 1) {
+      await Promise.resolve();
+    }
+    wrapper.update();
+
+    // Second column click
+    wrapper.find('.rc-cascader-menu-item-content').last().simulate('click');
+    for (let i = 0; i < 3; i += 1) {
+      await Promise.resolve();
+    }
+    wrapper.update();
+
+    expect(wrapper.find('ul.rc-cascader-menu')).toHaveLength(3);
+  });
+});