Fatal error: Uncaught Error: Call to a member function using_permalinks() on null
in /home/azar/public_html/wp-content/plugins/html-on-pages/html-on-pages.php on line 25

Call stack:

1. no_page_slash()
   wp-includes/class-wp-hook.php:287
2. WP_Hook::apply_filters()
   wp-includes/plugin.php:206
3. apply_filters()
   wp-content/plugins/sitepress-multilingual-cms/classes/utilities/class-wpml-slash-management.php:82
4. WPML_Slash_Management::user_trailingslashit()
   wp-content/plugins/sitepress-multilingual-cms/classes/utilities/class-wpml-slash-management.php:52
5. WPML_Slash_Management::maybe_user_trailingslashit()
   wp-content/plugins/sitepress-multilingual-cms/classes/url-handling/converter/strategy/class-wpml-url-converter-subdir-strategy.php:110
6. WPML_URL_Converter_Subdir_Strategy::convert_url_string()
   wp-content/plugins/sitepress-multilingual-cms/classes/url-handling/converter/class-wpml-url-converter.php:151
7. WPML_URL_Converter::convert_url()
   wp-content/plugins/sitepress-multilingual-cms/classes/url-handling/converter/class-wpml-url-cached-converter.php:33
8. WPML_URL_Cached_Converter::convert_url()
   wp-content/plugins/sitepress-multilingual-cms/classes/url-handling/wpml-url-filters.class.php:291
9. WPML_URL_Filters::home_url_filter()
   wp-includes/class-wp-hook.php:287
10. WP_Hook::apply_filters()
    wp-includes/plugin.php:206
11. apply_filters()
    wp-includes/link-template.php:3229
12. get_home_url()
    wp-includes/link-template.php:3171
13. home_url()
    wp-content/plugins/wordpress-seo/inc/sitemaps/class-sitemaps-renderer.php:337
14. WPSEO_Sitemaps_Renderer::get_xsl_url()
    wp-content/plugins/wordpress-seo/inc/sitemaps/class-sitemaps-renderer.php:52
15. WPSEO_Sitemaps_Renderer::__construct()
    wp-content/plugins/wordpress-seo/inc/sitemaps/class-sitemaps.php:113
16. WPSEO_Sitemaps::__construct()
    wp-content/plugins/wordpress-seo/wp-seo-main.php:312
17. wpseo_init()
    wp-includes/class-wp-hook.php:287
18. WP_Hook::apply_filters()
    wp-includes/class-wp-hook.php:311
19. WP_Hook::do_action()
    wp-includes/plugin.php:478
20. do_action()
    wp-settings.php:409
21. require_once()
    wp-config.php:89
22. require_once()
    wp-load.php:37
23. require_once()
    wp-blog-header.php:13
24. require()
    index.php:17