diff --git a/facets_overview/python/base_generic_feature_statistics_generator.py b/facets_overview/python/base_generic_feature_statistics_generator.py
index 3b7bc37..32eb9d3 100644
--- a/facets_overview/python/base_generic_feature_statistics_generator.py
+++ b/facets_overview/python/base_generic_feature_statistics_generator.py
@@ -272,7 +272,7 @@ def GetDatasetsProto(self, datasets, features=None,
               for val_index, val in enumerate(sorted_vals):
                 try:
                   if (sys.version_info.major < 3 or
-                      isinstance(data, (bytes, bytearray))):
+                      isinstance(val[1], (bytes, bytearray))):
                     printable_val = val[1].decode('UTF-8', 'strict')
                   else:
                     printable_val = val[1]