[Warning: Trying to access array offset on value of type bool in C:\xampp\htdocs\POS SYSTEM\2. User Module\controllers\users.controller.php on line 29]

hello pls i have been facing this error for days now . can someone help me to fix it. the bold line is the one having the warning message.

if($answer["username"] == $_POST["loginUser"] && $answer["password"] == $encryptpass)

                {

                    $_SESSION["loggedIn"] = "ok";

                    $_SESSION["id"] = $answer["id"];

                    $_SESSION["name"] = $answer["name"];

                    $_SESSION["username"] = $answer["username"];

                    $_SESSION["picture"] = $answer["picture"];

                    $_SESSION["profile"] = $answer["profile"];              

                    echo '<script>

                        window.location = "home";

                         </script>';

                }

                else

                {

                    echo '<br><div class="alert alert-danger">User or password incorrect</div>';

 

                }