Why is text not being rendered in a React component?

Question

React

There is an array of objects, each of which has its own array of objects containing text.
When outputting through the console, the text is displayed, as it should be:

console.log(this.state.cars[0].tariffs[this.state.tariffs[0]]['year']);

.
But when I start to display text from this array through the map in the component, nothing is displayed:

{this.state.cars.length && this.state.cars.map(item =>{
   return (<div key = {item.mark+item.model} className='car-block'>
         <div className='mark-model'>{item.mark} {item.model}</div>
        <div className='tar-0'>{item.tariffs.length && item.tariffs[this.state.tariffs[0]]['year']</div>
</div>)})}

. How to fix it?