Subsection “Plugins” not reachable (HTTP ERROR 500)

Hello;
first of all: thank you for your generally awesome plugin. ?? I have one issue, tho:

Whenever I try to go to the sub-listing-page for “Plugins”, that fails to load (stating an HTTP error 500). Clicking a plugin’s title from the partial listing on Locos’s main page works; the edit interface for individual plugins does work too. It’s only the full listing of plugins for translation ( /wp-admin/admin.php?page=loco-plugin ) that fails to open.

Thank you for whatever help you may be able to provide. Cheers – LX

The page I need help with: [log in to see the link]