Graph not displaying data

I'm kinda new to React and I was trying to make a graph using Recharts, but I lost myself in a problem where the lines of the graph doesnt appear.

I use this code

const [ graphData, setgraphData ] = useState([])

const createMockData = () => {
let data = [];
let value = 50;
for (var i = 0; i <= 5 ; i++){
  let date = new Date();
  date.setHours(0,0,0,0);
  date.setDate(i);
  value += Math.round((Math.random() < 0.5 ? 1 : 0) * Math.random() * 10);
  data.push({x: date, y: value});
} 
//console.log(data);
setgraphData(data);


}
useEffect(() => {
   createMockData();
});

To create a mockup data and this to present it

<LineChart width={500} height={200} data={graphData}>
    <Line type="monotone" dataKey={graphData.x} stroke="var(--mainColor)" />
    <XAxis dataKey={graphData.y} />
    <Tooltip />
</LineChart>

And I dont know what I'm doing wrong. When I use a normal array it works fine, but I need the graph to be like 100 values.

Thank you

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