Updating WordPress seems to be causing errors in theme

I have the following errors to my Aegaeus WP Theme after updating WordPress (5.2.3)
Warning: DOMDocument::load(): AttValue: ” or ‘ expected in http://hb-themes.com/home/feed/, line: 1 in /home1/nobnf5/public_html/nwpenergy.com/wp-content/themes/AegaeusWP/functions.php on line 463

Warning: DOMDocument::load(): attributes construct error in http://hb-themes.com/home/feed/, line: 1 in /home1/nobnf5/public_html/nwpenergy.com/wp-content/themes/AegaeusWP/functions.php on line 463

Warning: DOMDocument::load(): Couldn’t find end of Start Tag body line 1 in http://hb-themes.com/home/feed/, line: 1 in /home1/nobnf5/public_html/nwpenergy.com/wp-content/themes/AegaeusWP/functions.php on line 463

Warning: DOMDocument::load(): Opening and ending tag mismatch: html line 1 and body in http://hb-themes.com/home/feed/, line: 1 in /home1/nobnf5/public_html/nwpenergy.com/wp-content/themes/AegaeusWP/functions.php on line 463

Warning: DOMDocument::load(): Extra content at the end of the document in http://hb-themes.com/home/feed/, line: 1 in /home1/nobnf5/public_html/nwpenergy.com/wp-content/themes/AegaeusWP/functions.php on line 463
You are using Aegaeus theme. Version 4.1.

Is there anything I should do to correct these items? Thanks – this is the first issue I have had with your theme, which has been great!