Fatal Error Message | WordPress.org

Hello, I am receiving the following error only when I make a new post on my page. What could be the cause? Could this be a theme issue?

.wp-die-message { display: none; }

Fatal error: Uncaught Error: Cannot access offset of type string on string
in /home2/exp2ore7ous98nco/public_html/wp-content/themes/houston-county/template-parts/menu-list-meta.php on line 38

Call stack:

1. require()
   wp-includes/template.php:792
2. load_template()
   wp-includes/template.php:725
3. locate_template()
   wp-includes/general-template.php:206

The page I need help with: [log in to see the link]