Warning: "Deprecated htmlspecialchars():" in Menu Item

I am creating a Menu item to showcase a category from Gridbox Blog (called Magazine).
However, I get a warning that states: "Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /home/starmusicawards/public_html/administrator/components/com_gridbox/models/fields/blog.php on line 61"

See screenshot link - https://prnt.sc/IDezCSmpSXbN
How can I resolve this?

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