PHP Warning: Creating default object from empty value

Hi,
Since last four days, I started getting this PHP warning error message with quite a high frequency. Every singly minute it is appearing twice in error log.

[17-Oct-2020 14:43:33 America/New_York] PHP Warning:  Creating default object from empty value in /home/seisense/journal.seisense.com/cache/t_compile/d184190238979e9322d6f49b1b393713c9f3c084^52019e87b90081f2c6bfa717994d81ab7712dd1f_0.app.frontendcomponentssearchF.php on line 30

I looked into the cache > t_compile for the said PHP file and found the following on line 30

<?php echo parse_str(parse_url($_smarty_tpl->smarty->ext->_capture->getBuffer($_smarty_tpl, 'searchFormUrl'),@constant('PHP_URL_QUERY')),$_smarty_tpl->tpl_vars['formUrlParameters']->value);?>

Can anyone guide me on this warning, why it started appearing, and how to resolve it?

OJS: 3.2.1.1

Thanks