Further Edited: Carla.app crashes when trying to Add Plugin

[DanielBielak]

macOS 10.14.6
Carla version 2.5.9 (and earlier)

Carla.app crashes after clicking the "Add Plugin" toolbar button or the "Add Plugin..." menu item of the right-click pop-up menu.

Edit:

The first time I used Carla.app, adding a plugin worked fine. Then I think I tried to add a certain plugin (I don't know which one) and I think Carla crashed after that whenever I tried to add plugins, except for when I added a plugin (Surge XT) that I had Favorited.

Is there a way to clear Carlas's cache(?) of plugins or Carla's list of plugins?

Additional Edit:

This issue happens even when all the "Plugin Paths" lists in Carla.app's "Preferences" are empty, and even when all the folders listed in the "Plugin Paths" lists for VST's in Carla.app's "Preferences" are empty.