Hello,
Sorry for the delay ; I'm working on a new release of HikaSerial for that.
There is another plugin in HikaSerial which can have the same kind of issue ; so I'm patching both for a new release.
In the plugin "serialprivatecontent", please replace
if(!class_exists('hikashopJoomlaPlugin')) return;
By
if(!class_exists('hikashopJoomlaPlugin')) return;
if(HIKASHOP_J50 && !Joomla\CMS\Plugin\PluginHelper::isEnabled('behaviour', 'compat')) {
$aliases = array (
'JPluginHelper' => 'Joomla\CMS\Plugin\PluginHelper',
'JRegistry' => 'Joomla\Registry\Registry',
'JFactory' => 'Joomla\CMS\Factory',
'JText' => 'Joomla\CMS\Language\Text',
);
foreach($aliases as $alias => $original) {
if(!class_exists($alias))
class_alias($original, $alias);
}
}
And it should fix the issue with that plugin before the new release.
Regards,