Magento 2 Unable to find a physical ancestor for a theme

Question

I've delete Magento 2 theme folder and upload it again but when upgrade it via command line i've got an error say Unable to find a physical ancestor for a theme so any suggestion about that?

Answer 1

You need to check in database theme table column type should be 0 for all.

Answer 2

You might want to check table theme. All themes should have type set to 0. Sometimes magento likes to change it to 1 (virtual theme).

Check also if parent_id is correct.

Unable to find a physical ancestor for a theme / How do I correct the following in Magento 2.1.2: Fatal error: Call to a member function getId() on null

Works like a charm. Fork the database and you're good to go.

Answer 3

You can try to deploy the static content

bin/magento setup:static-content:deploy -f

Answer 4

You need to update the type from the theme table, which may be changed. Please run below SQL

update theme set type=0;

After that, you need to run the below magento command.

php bin/magento setup:upgrade
php bin/magento s:s:d -f 
php bin/magento cache:clean

Thanks, Ansar Husain