What's the problem in this code

Question

https://code.sololearn.com/wmlA5r79hS7N/?ref=app
This is the page :
https://naijalife.000webhostapp.com/inbox.php

Answer 1

You are missing a double quote at the end of line 4

$sql = "SELECT FROM chat WHERE user_b = '".$name."'";

Answer 2

Thanks