com_api does not work on joomla 5

Hi

I am using com_api on Joomla 3 but after updating to Joomla 5, it does not work.
Installed com_api_v3.0.2_05cea7a (which states Joomla 4 support).

Error is

Call to undefined method Joomla\CMS\Application\AdministratorApplication::isAdmin()

Could you fix this?

Thanks