diff --git a/docs/examples/modes.tsx b/docs/examples/modes.tsx
index b88f0b112..da7eb8b37 100644
--- a/docs/examples/modes.tsx
+++ b/docs/examples/modes.tsx
@@ -10,7 +10,7 @@ const defaultStartValue = moment('2019-09-03 05:02:03');
 const defaultEndValue = moment('2019-11-28 01:02:03');
 
 function formatDate(date: Moment | null) {
-  return date ? date.format('YYYY-MM-DD HH:mm:ss') : 'null';
+  return date ? date.format('YYYY-MM-DD HH:mm:ss') : null;
 }
 
 export default () => {
@@ -52,4 +52,4 @@ export default () => {
       </div>
     </div>
   );
-};
+};
\ No newline at end of file
diff --git a/src/PickerInput/hooks/useRangePickerValue.ts b/src/PickerInput/hooks/useRangePickerValue.ts
index 6530d5d17..2590a3355 100644
--- a/src/PickerInput/hooks/useRangePickerValue.ts
+++ b/src/PickerInput/hooks/useRangePickerValue.ts
@@ -146,7 +146,7 @@ export default function useRangePickerValue<DateType extends object, ValueType e
       }
 
       // Year offset
-      if (pickerMode === 'year') {
+      if (pickerMode === 'year' && startDate) {
         const srcYear = Math.floor(generateConfig.getYear(startDate) / 10);
         const tgtYear = Math.floor(generateConfig.getYear(endDate) / 10);
         if (srcYear !== tgtYear) {
diff --git a/tests/keyboard.spec.tsx b/tests/keyboard.spec.tsx
index e7a09648c..17a81cb2b 100644
--- a/tests/keyboard.spec.tsx
+++ b/tests/keyboard.spec.tsx
@@ -36,7 +36,7 @@ describe('Picker.Keyboard', () => {
       charCode: keyCode,
       ...info,
     });
-    // document.querySelector('.rc-picker-panel').simulate('keyDown', { which: keyCode, ...info });
+    document.querySelector('.rc-picker-panel').simulate('keyDown', { which: keyCode, ...info });
   }
 
   beforeEach(() => {
diff --git a/tests/picker.spec.tsx b/tests/picker.spec.tsx
index d6751c775..1dc77d4dd 100644
--- a/tests/picker.spec.tsx
+++ b/tests/picker.spec.tsx
@@ -18,6 +18,7 @@ import {
   confirmOK,
   // MomentPicker,
   DayPicker,
+  DayRangePicker,
   findCell,
   getDay,
   isOpen,
@@ -288,6 +289,22 @@ describe('Picker.Basic', () => {
         expect(document.querySelector(selected)).toBeFalsy();
       });
     });
+
+    // https://github.com/ant-design/ant-design/issues/49400
+    it('should not throw errow when input end year first', () => {
+      const { container } = render(
+        <DayRangePicker picker="year" />,
+      );
+      openPicker(container);
+      fireEvent.focus(container.querySelectorAll('input')[1]);
+      expect(() => {
+        fireEvent.change(container.querySelectorAll('input')[1], {
+          target: {
+            value: '2024',
+          },
+        });
+      }).not.toThrow();
+    });
   });
 
   describe('focus test', () => {