Formik的handleChange在DateInput的onChange上抛出"TypeError: null不是对象(计算'_a.type')“

import { useFormik } from 'formik';

const MyForm = () => {
  const formik = useFormik({
    initialValues: {
      date: null,
    },
    onSubmit: values => {
      console.log(values);
    },
  });

  const handleDateChange = (event) => {
    if (event.target.value !== null) {
      formik.handleChange(event);
    }
  };

  return (
    <form onSubmit={formik.handleSubmit}>
      <DateInput
        name="date"
        value={formik.values.date}
        onChange={handleDateChange}
      />
      <button type="submit">Submit</button>
    </form>
  );
};