InvalidPropertyFetch

A property is accessed with ->prop on a value that is not an object. At runtime this will produce a fatal error.

Example

<?php
function getLabel(string $item): string {
    return $item->label; // string is not an object
}

How to fix

Ensure the value is an object before accessing its properties, or fix the type annotation:

<?php
function getLabel(Item $item): string {
    return $item->label;
}