I have this in my logs:
TypeError: array_keys(): Argument #1 ($array) must be of type array, null given (0)
#0 /var/www/forum_adrp/system/Application/Application.php(384): array_keys()
#1 /var/www/forum_adrp/applications/core/modules/setup/upgrade/login.php(88): IPS\_Application::getAvailableVersion()
#2 /var/www/forum_adrp/system/Dispatcher/Controller.php(118): IPS\core\modules\setup\upgrade\_login->manage()
#3 /var/www/forum_adrp/system/Dispatcher/Setup.php(220): IPS\Dispatcher\_Controller->execute()
#4 /var/www/forum_adrp/admin/upgrade/index.php(34): IPS\Dispatcher\_Setup->run()
#5 {main}
#0 /var/www/forum_adrp/init.php(1029): IPS\_Log::log()
#1 [internal function]: IPS\IPS::exceptionHandler()
#2 {main}