inheritance support?

[kolisko]

Does uml gen support inheritance definition? I have got NPE when I tried to use json with inheritance definition.

INFO: Processing Model UICLParametrizationBonus
Mar 07, 2018 10:57:49 PM com.kicksolutions.swagger.plantuml.PlantUMLGenerator transformSwagger2Puml
SEVERE: null
java.lang.NullPointerException
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.getClassMembers(PlantUMLCodegen.java:745)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.getClassMembers(PlantUMLCodegen.java:693)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.processSwaggerModels(PlantUMLCodegen.java:577)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.preprocessSwagger(PlantUMLCodegen.java:120)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.generatePuml(PlantUMLCodegen.java:83)
	at com.kicksolutions.swagger.plantuml.PlantUMLGenerator.transformSwagger2Puml(PlantUMLGenerator.java:43)
	at com.kicksolutions.swagger.Swagger2PlantUML.process(Swagger2PlantUML.java:73)
	at com.kicksolutions.swagger.Swagger2PlantUML.init(Swagger2PlantUML.java:57)
	at com.kicksolutions.swagger.Swagger2PlantUML.main(Swagger2PlantUML.java:39)

Exception in thread "main" java.lang.RuntimeException: java.lang.NullPointerException
	at com.kicksolutions.swagger.plantuml.PlantUMLGenerator.transformSwagger2Puml(PlantUMLGenerator.java:53)
	at com.kicksolutions.swagger.Swagger2PlantUML.process(Swagger2PlantUML.java:73)
	at com.kicksolutions.swagger.Swagger2PlantUML.init(Swagger2PlantUML.java:57)
	at com.kicksolutions.swagger.Swagger2PlantUML.main(Swagger2PlantUML.java:39)
Caused by: java.lang.NullPointerException
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.getClassMembers(PlantUMLCodegen.java:745)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.getClassMembers(PlantUMLCodegen.java:693)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.processSwaggerModels(PlantUMLCodegen.java:577)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.preprocessSwagger(PlantUMLCodegen.java:120)
	at com.kicksolutions.swagger.plantuml.PlantUMLCodegen.generatePuml(PlantUMLCodegen.java:83)
	at com.kicksolutions.swagger.plantuml.PlantUMLGenerator.transformSwagger2Puml(PlantUMLGenerator.java:43)
	... 3 more
1 Michal-MacBook-Pro:target kolisko$ 

here is the definition file:

swagger.txt