Is there a way to force the site to the default theme?

Describe the issue or problem
Im working in a subtheme and modifying a .tpl file I made a mistake and get a blank screen in the site.
I debug in the terminal and get where is the problem. but I think if there is a way to force a site to use default theme (or another theme) when something like this happen.

What application are you using?
Im using ojs