diff --git a/tpl/macros_struct.twig b/tpl/macros_struct.twig
index 3c931a6..4800962 100644
--- a/tpl/macros_struct.twig
+++ b/tpl/macros_struct.twig
@@ -603,10 +603,12 @@ func (s *{{ name|default(s.name) }}) ReadFields(reader meta.Reader) error {
 			return err
 		}
 	} else {
-		{{ fname }} = v.(I{{ type.name }})
-		{% if has_table_token %}
-			s.changedFields.SetChanged("{{ alias }}")
-		{% endif %}
+		if v != nil {
+			{{ fname }} = v.(I{{ type.name }})
+			{% if has_table_token %}
+				s.changedFields.SetChanged("{{ alias }}")
+			{% endif %}
+		}
 	}
 	{% else %}
 	if err := reader.BeginContainer("{{ alias }}"); err != nil {