“Trying to get properties on a non-object” in PHP

Question

I\'m a WordPress theme developer and on a theme I\'m working on, I\'ve turned on debug mode and get this error inside a select drop-down box for the theme\'s options page. <

Answer 1

You're doing this a couple of times:

$option->someproperty

In at least one of the cases $option is not an object. When you then do -> on a non-object, you get that error.

First, verify that $option is actually an object and correct the usage if it is not.

If $option is an array then @matthewpavkov is correct, you should do $option['someproperty'] instead of $option->someproperty.

If $option is usually an object, perhaps get_categories() is sometimes returning null or false in a failure condition. Check for that before accessing $option.

Like so:

foreach ($value['options'] as $option)
{
    if ($option)
    {
        // do whatever;
    }
}