How to solve "Uncaught TypeError: Cannot read properties of undefined" in Javascript

`// Search Chat
const searchMessage = () => {
const val = messageSearch.value.toLowerCase();
message.forEach(chat => {
let name = chat.querySelectorAll("h5").textContent.toLowerCase();
if (name.indexOf(val) != -1) {
chat.style.display = "flex";
} else {
chat.style.display = "none";
}
});
}

//Search Message
messageSearch.addEventListener("keyup", searchMessage);`