diff --git a/conversion_utils/jos_msds_and_properties.py b/conversion_utils/jos_msds_and_properties.py
index d43c6f2..24bf56f 100644
--- a/conversion_utils/jos_msds_and_properties.py
+++ b/conversion_utils/jos_msds_and_properties.py
@@ -227,8 +227,9 @@ class Converter:
                 value = feature.find_value_by_char(value_char, msd.language)
                 feature_name = feature.names.get(language)
                 feature_value = value.names.get(language)
-                if (lemma is None and category_name in [level_exception[0] for level_exception in LEVEL_EXCEPTIONS]):
-                    exit('[ERROR] lemma is None but feature levels depend on lemma for category {}'.format(category_name))
+                if (lemma is None and (category_name, index) in [(le[0], le[1]) for le in LEVEL_EXCEPTIONS]):
+                    exit('[ERROR] lemma is None but feature level depends on lemma for category={category}, position={position}'\
+                         .format(category=category_name, position=index))
                 level_exception_flag = (category_name, feature.position, lemma) in LEVEL_EXCEPTIONS
                 lexeme_level_flag = feature.lexeme_level_flag if not level_exception_flag else not feature.lexeme_level_flag
                 feature_value_list.append((feature, value))