import React from 'react'
import {Breadcrumb} from 'react-bootstrap'
import {IndexLinkContainer as Link} from 'react-router-bootstrap'

export default class Breadcrumbs extends React.Component {
	makeItem(item) {
		return (
			<Link key={item[1]} to={item[1]}>
				<Breadcrumb.Item>{item[0]}</Breadcrumb.Item>
			</Link>
		)
	}

	render() {
		let {items, ...props} = this.props

		return (
			<Breadcrumb {...props}>
				{this.makeItem(['ANET', '/'])}
				{items.map(this.makeItem)}
			</Breadcrumb>
		)
	}
}

Breadcrumbs.defaultProps = {items: []}

import React from 'react'
import {Breadcrumb} from 'react-bootstrap'
import {IndexLinkContainer as Link} from 'react-router-bootstrap'

export default class Breadcrumbs extends React.Component {
	makeItem(item) {
		return (
			<Link key={item[0]} to={item[1]}>
				<Breadcrumb.Item>{item[0]}</Breadcrumb.Item>
			</Link>
		)
	}

	render() {
		let {items, ...props} = this.props

		return (
			<Breadcrumb {...props}>
				{this.makeItem(['ANET', '/'])}
				{items.map(this.makeItem)}
			</Breadcrumb>
		)
	}
}

Breadcrumbs.defaultProps = {items: []}

--- 
+++ 
@@ -5,7 +5,7 @@
 export default class Breadcrumbs extends React.Component {
 	makeItem(item) {
 		return (
-			<Link key={item[1]} to={item[1]}>
+			<Link key={item[0]} to={item[1]}>
 				<Breadcrumb.Item>{item[0]}</Breadcrumb.Item>
 			</Link>
 		)
Use URL as unique key for breadcrumb items
