Running development version of pgAdmin 4 corrupts the configuration

I was using pgAdmin 4 without any problems, until I started mucking around with the development version of pgAdmin 4 from the Git repository. 

After that, pgAdmin 4 fail to launch, with the following error:

I do not see any files in $HOME/.pgadmin that I can tweak to solve the issue. 

My workaround is to rename the $HOME/.pgadmin directory so that launching pgAdmin 4 again will regenerate fresh files. 

Is there any way to fix the configuration for pgAdmin 4? Or are those settings actually stored in a database?

Best regards,

Hanxue