Steps to reproduce the issue

Upgraded to Joomla 3.7

Expected result

Smooth execution of existing code

Actual result

Warning: Cannot use a scalar value as an array in /home/silentservicemc/public_html/libraries/cms/html/html.php on line 620

Warning: Cannot use a scalar value as an array in /home/silentservicemc/public_html/libraries/cms/html/html.php on line 621

Warning: Cannot use a scalar value as an array in /home/silentservicemc/public_html/libraries/cms/html/html.php on line 622

Warning: Cannot use a scalar value as an array in /home/silentservicemc/public_html/libraries/cms/html/html.php on line 623

Here is the block of code from HTML.php::
else
{
$options['relative'] = isset($options['relative']) ? $options['relative'] : false;
$options['pathOnly'] = isset($options['pathOnly']) ? $options['pathOnly'] : false;
$options['detectBrowser'] = isset($options['detectBrowser']) ? $options['detectBrowser'] : true;
$options['detectDebug'] = isset($options['detectDebug']) ? $options['detectDebug'] : true;
}

System information (as much as possible)

Host: GoDaddy.com
PHP version: 5.6
Joomla: 3.7
Template: Beeze!

Additional comments