Scroll down to bottom of a div

I am try to make it automaticly scroll down on every button button click
in ReactJs
what i have tried:

const chat = document.getElementById("ChatArea");
chat.scrollTop = chat.scrollHeight;

the div with the scroll bar:

border: 1px solid gray;
width: 50%;
margin: auto;
height: 400px;
display: flex;
  flex-direction: column;
  overflow-y: scroll;

i get the error:
Cannot read properties of null (reading ‘scrollHeight’)

This means that document.getElementById("ChatArea") is returning null instead of an element. Are you sure the id is correct?

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