diff --git a/beets/library.py b/beets/library.py
index f8d226dbe..74b669c03 100644
--- a/beets/library.py
+++ b/beets/library.py
@@ -1421,7 +1421,7 @@ class DefaultTemplateFunctions(object):
         # Find matching albums to disambiguate with.
         subqueries = []
         for key in keys:
-            value = getattr(album, key)
+            value = album.get(key, '')
             subqueries.append(dbcore.MatchQuery(key, value))
         albums = self.lib.albums(dbcore.AndQuery(subqueries))
 
@@ -1434,7 +1434,7 @@ class DefaultTemplateFunctions(object):
         # Find the first disambiguator that distinguishes the albums.
         for disambiguator in disam:
             # Get the value for each album for the current field.
-            disam_values = set([getattr(a, disambiguator) for a in albums])
+            disam_values = set([a.get(disambiguator, '') for a in albums])
 
             # If the set of unique values is equal to the number of
             # albums in the disambiguation set, we're done -- this is
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 534a7d100..adc70a6bc 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -92,6 +92,8 @@ Fixes:
   did. :bug:`1657`
 * :doc:`/plugins/scrub`: Also in ``auto`` mode, album art is now correctly
   restored. :bug:`1657`
+* Possibly allow flexible attributes to be used with the ``%aunique`` template
+  function. :bug:`1775`
 
 .. _Emby Server: http://emby.media