diff --git a/openpype/hosts/photoshop/plugins/publish/validate_unique_subsets.py b/openpype/hosts/photoshop/plugins/publish/validate_unique_subsets.py
index 15ae5fbcea..e000352601 100644
--- a/openpype/hosts/photoshop/plugins/publish/validate_unique_subsets.py
+++ b/openpype/hosts/photoshop/plugins/publish/validate_unique_subsets.py
@@ -1,3 +1,4 @@
+import collections
 import pyblish.api
 import openpype.api
 
@@ -16,11 +17,16 @@ class ValidateSubsetUniqueness(pyblish.api.ContextPlugin):
         subset_names = []
 
         for instance in context:
+            self.log.info("instance:: {}".format(instance.data))
             if instance.data.get('publish'):
                 subset_names.append(instance.data.get('subset'))
 
+        non_unique = \
+            [item
+             for item, count in collections.Counter(subset_names).items()
+             if count > 1]
         msg = (
-            "Instance subset names are not unique. " +
-            "Remove duplicates via SubsetManager."
+            "Instance subset names {} are not unique. " +
+            "Remove duplicates via SubsetManager.".format(non_unique)
         )
-        assert len(subset_names) == len(set(subset_names)), msg
+        assert not non_unique, msg