MYSQL error message on home page

Hello,

I have recently discovered the below error message is coming up on my home page.

Warning: mysqli_num_fields() expects parameter 1 to be mysqli_result, boolean given in /home/jobsair0/public_html/wp-includes/wp-db.php on line 3021
class=”home page page-id-78 page-template-default pmpro-body-has-access tc-fade-hover-links skin-shadow tc-no-sidebar customizr tc-sticky-header sticky-disabled tc-transparent-on-scroll skin-blue tc-regular-menu” itemscope itemtype=”https://schema.org/WebPage”>

I am unsure on how to fix this error. The website is https://jobsair.com.au/

Would anyone have any suggestions?

Any help would be much appreciated.

Kind regards
Nicole