diff --git a/swagger2puml-core/src/main/java/com/kicksolutions/swagger/plantuml/PlantUMLCodegen.java b/swagger2puml-core/src/main/java/com/kicksolutions/swagger/plantuml/PlantUMLCodegen.java
index 1164131..57753bc 100644
--- a/swagger2puml-core/src/main/java/com/kicksolutions/swagger/plantuml/PlantUMLCodegen.java
+++ b/swagger2puml-core/src/main/java/com/kicksolutions/swagger/plantuml/PlantUMLCodegen.java
@@ -733,7 +733,7 @@ private List<ClassMembers> getClassMembers(ComposedModel composedModel, Map<Stri
 
 		Map<String, Property> childProperties = new HashMap<String, Property>();
 
-		if (null != composedModel.getChild()) {
+		if (null != composedModel.getChild() && null != composedModel.getChild().getProperties()) {
 			childProperties = composedModel.getChild().getProperties();
 		}
 
@@ -999,4 +999,4 @@ private String toTitleCase(String input) {
 
 		return titleCase.toString();
 	}
-}
\ No newline at end of file
+}