Ojs - Static pages in navigation manu started showing blank white page


Yesterday our OJS app started showing blank pages when clicked on some static links in the navigation menu. All the other parts of the site work fine.

When I open inspector in browser development kit, it shows empty html, head and body tags, as if page is downloaded from the server but it can’t download head and body data.

I tried enabling php errors, it does not show any error, just this notice x10:
Notice : Deprecated call without request object. in /home/idn/public_html/ojs3/stanovnistvo/lib/pkp/classes/template/PKPTemplateManager.inc.php on line 901

We had a disk space issue few days ago on the host server, I am wondering if that could cause this issue.

I would provide more info if needed.

Could you please assist?