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Description of my issue:
I am testing Joomla! 4 for a while and used Akeeba backup without errors.
This morming, with the last nghty build of alpha7, when updating Akeeba backup from 6.3.3 to 6.4.0 (and after uninstalling and reinstalling 6.3.3 or 6.4.0 version), I have that error : "Call to undefined method Joomla\CMS\Application\AdministratorApplication::isAdmin() ".
i tried on another new site (new installation of 4.0.0 alpha 7 nighty build last built: Saturday, 16 February 2019 03:00:47 UTC) and have the same error.
|Joomla! version (in x.y.z format)||4.0.0 alpha7|
|PHP version (in x.y.z format)||7.2.13|
|Akeeba Backup version (x.y.z format)||6.4.0|