问react-leaflet库中的映射组件给出“不变冲突:元素类型无效”错误

EN

Uncaught Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

Check the render method of `Map`.

import React, {Component} from "react";
import classNames from "classnames";
import {Map} from "react-leaflet";

class FdMap extends Component {
    mapRef = (map) => {
        if (map) {
            this.mapLeaflet = map.leafletElement;
            map.leafletElement.scrollWheelZoom.disable();

            map.leafletElement.on("focus", function () {
                map.leafletElement.scrollWheelZoom.enable();
            });

            map.leafletElement.on("blur", function () {
                map.leafletElement.scrollWheelZoom.disable();
            });
        }
    };

    render() {
        const {
          className,
          children
        } = this.props;
        const containerClassName = classNames(
          "fd-map",
          className
        );

        return (
            <Map ref={this.mapRef}
                 {...this.props}
                 className={containerClassName}>
                {children}
            </Map>
        );
    };
}

export default FdMap;

"react": "16.4.1",
"leaflet": "1.3.1"