query.php: get_queried_object() result cannot be assumed to be non-NULL

[lkraav]

I'm dealing with a WPMUdev plugin called MarketPress. Its /store/products/ page is a special CPT catalog thing that seems to have wp_title() issues, so I dug into it.

Turns out that:

is_front_page() -> is_page() -> $page_obj = $this->get_queried_object() -> $page_obj == NULL

But is_page() (and other is_...()) go harrassing $page_obj assuming there's always something useful there. This creates a flood of "non-object access" notices.

I would expect something like this to make sense in these is_...() functions:

if (!is_null($page_obj)) return false;

Since WP_Query::get_queried_object() first sets its result as null and returning a value is actually conditional, I don't see a way around these checks. Enlighten me please if I'm wrong.

I've looked at #19035, #18614, #17662. All of them are situations where there's at least something there in $page_obj. None of them seem to discuss or patch NULL values.

I discovered this on 3.3.2, but todays trunk trunk/wp-includes/query.php@21248#L3340​ has the same code.

Bleh. Ignore the "patch" above.

if (is_null($page_obj)) return false;