Trying to load the attached plugin crashes Picard

E: 17:43:39,062 pluginmanager.plugin_error:174: Fehler beim Laden des gezippten Plugins 'add_album_column'
Traceback (most recent call last):
File "./picard/ui/options/plugins.py", line 601, in open_plugins
self.manager.install_plugin(path)
File "./picard/pluginmanager.py", line 397, in install_plugin
self.plugin_installed.emit(installed_plugin, False)
TypeError: PluginManager.plugin_installed[PluginWrapper, bool].emit(): argument 1 has unexpected type 'NoneType'
zsh: abort (core dumped) ./tagger.py