### Describe the bug

https://github.com/developer-choi/axios-error-report

TypeError is occurred (in 1.6.6 version)

<img width="184" alt="image" src="https://github.com/axios/axios/assets/51902362/1f7f6e7f-8c8b-4ef7-9854-5c08f572d58b">

<img width="171" alt="image" src="https://github.com/axios/axios/assets/51902362/36042439-a071-485e-b696-9f2c01849759">

### To Reproduce

https://github.com/developer-choi/axios-error-report

### Code snippet

_No response_

### Expected behavior

_No response_

### Axios Version

1.6.6

### Adapter Version

_No response_

### Browser

CHROME

### Browser Version

120.0.6099.225

### Node.js Version

20.11.0

### OS

Window 11
lib/core/Axios.js
return function httpMethod(url, data, config) {
      return this.request(mergeConfig(config || {}, {
        method,
        headers: isForm ? {
          'Content-Type': 'multipart/form-data'
        } : {},
        url,
        data
      }));
    };
  }
  Axios.prototype[method] = generateHTTPMethod();
  Axios.prototype[method + 'Form'] = generateHTTPMethod(true);
});
export default Axios;