Dynamic page visibility throws a critical error

[MakaryGo]

Grav	Admin	Login
v1.7.0-rc.3	v1.10.0-rc.3	v3.0.5

When dynamic_page_visibility: is set to true Grav throws a critical error:

grav.CRITICAL: Call to a member function header() on null

Full log included:
error.last.log

[MakaryGo]

Still happens on Admin v1.10-rc.6 & Grav v1.7.0-rc.6

Any chance for this function to work in 1.7?
Log below.

public function pageVisibility(Event $e)
    {
        if ($this->config->get('plugins.login.dynamic_page_visibility')) {
            /** @var Pages $pages */
            $pages = $e['pages'];
            $user = $this->grav['user'];

            foreach ($pages->instances() as $page) {
                $header = $page->header();
                if (isset($header) && isset($header->access) && isset($header->login['visibility_requires_access']) && $header->login['visibility_requires_access'] === true) {
                    $config = $this->mergeConfig($page);
                    $access = $this->login->isUserAuthorizedForPage($user, $page, $config);
                    if ($access === false) {
                        $page->visible(false);
                    }
                }
            }
        }
    }

[mahagr]

It looks like $pages->instances() returns null as some page. Look for a broken page.

[mahagr]

@MakaryGo Could you test with latest Grav CI build if your issue is fixed? We're going to do release maybe tomorrow.

Thanks!