Why does an empty section give a 502 error?

Question

1C-Bitrix

Hello comrades!

The directory path is built from the partition. There is an IB with sections "Profile, Pipes, Lattices".
The directory is made in such a way that the site.ru/profil/ address is from the root, etc. We go to the "Profile" there its subsections, in the subsections products.

There are no elements in the lattices, and when you go to the section, an error 502 is returned

. Everything is fine in the component settings.

"SEF_MODE" => "Y",
    "SEF_FOLDER" => "/reshetki/",
    "SEF_URL_TEMPLATES" => array(
      "sections" => "",
      "section" => "#SECTION_CODE#/",
      "element" => "#SECTION_CODE#/#ELEMENT_CODE#/",
      "compare" => "compare.php?action=#ACTION_CODE#",
      "smart_filter" => "#SECTION_CODE#/filter/#SMART_FILTER_PATH#/apply/",
    ),

What could be the reason for this behavior?