I have a file called "La vie en rose", by artist "Émilie Simon" in a cluster. I right click on it and select "Search for similar tracks...". This shows a list of recordings where I select on the first one (which is https://musicbrainz.org/recording/7f7dfdc4-c5ed-45b3-9363-a403ddff8445 ) and picard crashes with the following backtrace:

Traceback (most recent call last):
 File "/usr/lib64/python3.6/site-packages/picard/ui/searchdialog/_init_.py", line 345, in accept
   self.accept_event(row)
 File "/usr/lib64/python3.6/site-packages/picard/ui/searchdialog/track.py", line 172, in accept_event
   self.load_selection(arg)
 File "/usr/lib64/python3.6/site-packages/picard/ui/searchdialog/track.py", line 201, in load_selection
   album = self.file_.parent.album
AttributeError: 'Cluster' object has no attribute 'album'
Aborted (core dumped)