Hi I am facing this problem

[Shanto96]

TypeError: Cannot read property 'username' of undefined

When
6 | const isFirstMessageByUser = !lastMessage || lastMessage.sender.username!==message.sender.username;

when the lastMessage is undefined like messages[null]

[ydroopert]

Hi! would need a bit more detail but I would say it should be one of the two following problems.
1.
You forgot to declare it first:

const TheirMessage = ({ lastMessage, message }) => {
const isFirstMessageByUser = !lastMessage || lastMessage.sender.username !== message.sender.username;

2. You didn't pass in the props properly in ChatFeed.jsx:

{isMyMessage
?
: }

[princemore101]

hey !! i have a problem , I am not able to see the message which i send i get 429 error in the console window . please help me with the problem as soon as possible .