error 500 while accessing Logo & Theme

[fgrs]

this is clearly not my day, now after messing around with template I can't access Theme & Logo page anymore and I see following error that prevents me from switching to a different theme:

An exception has been thrown during the rendering of a template ("Parameter "themeName" for route "admin_themes_enable" must match "[a-zA-Z0-9_.-]+" ("" given) to generate a corresponding URL.").

any idea how to fix it or manually switch theme[ etc from phpmyadmin?

Edited September 11, 2020 by fgrs (see edit history)

[fgrs]

the error goes away if I turn Debug Mode off and I can access Themes page but the weird thing is that one of my themes has missing name in the admin it only shows empty "Version, Designed by" which makes me think there's some bad caching going on and  theme.yml doesn't get loaded properly,

any idea?

[musicmaster]

Did you check the obvious?:

 - what is the name of your theme in your file system under the Themes directory?

 - is the same name used in the ps_shop table?