Error in Helper Text.php file; search returns...

When certain search terms are executed in Joomla site search, a 404 page is returned instead of search results.
Within the <title> tag of the 404 page, the following debug message is appended:

"0 RegularLabs\Library\HtmlTag::isSelfClosingTag(): Argument #1 ($type) must be of type string, null given, called in /home/customer/www/cityofeagan.com/public_html/plugins/system/articlesanywhere/src/DataGroups/Helpers/Text.php on line 328"

Line 328 of Text.php:

"if (RL_HtmlTag::isSelfClosingTag($tag))"

Unclear why this appears with some terms, but not others; have yet to determine any correlation. Could there be conflict with the search plugin?

Any help or insights would be helpful. Thank you.

Thank you. That appears to correct the issue. Appreciate the fix and quick response.