Going to Options -> Options... -> Plugins -> Install plugin... opens a file chooser dialog. Clicking on the Close-button results in a crash of picard instead of just closing the file chooser dialog.

Traceback (most recent call last):
File "/home/user/.virtualenvs/picard/lib/python3.6/site-packages/picard/ui/options/plugins.py", line 317, in open_plugins
 self.tagger.pluginmanager.install_plugin(path)
  File "/home/user/.virtualenvs/picard/lib/python3.6/site-packages/picard/plugin.py", line 365, in install_plugin
 zip_plugin = is_zip(path)
  File "/home/user/.virtualenvs/picard/lib/python3.6/site-packages/picard/plugin.py", line 65, in is_zip
 if os.path.splitext(path)[1] == '.zip':
  File "/usr/lib/python3.6/posixpath.py", line 120, in splitext
  p = os.fspath(p)
 TypeError: expected str, bytes or os.PathLike object, not list
  Abgebrochen (Speicherabzug geschrieben)