import org.springframework.cloud.contract.spec.Contract

Contract.make {
    description('kafka null')

    label('triggerTombstoneEvent')
    input {
        triggeredBy('triggerTombstoneEvent()')
    }
    outputMessage {
        sentTo('static-instrument')
        headers {
            header('kafka_messageKey', 'MY_KEY')
        }
    }
}

  @Autowired
  private StubTrigger stubTrigger;
  ....
  public void myTest() {
    stubTrigger.trigger("triggerTombstoneEvent");
    

 java.lang.NullPointerException: Cannot invoke "org.springframework.cloud.contract.spec.internal.DslProperty.getClientValue()" because "body" is null
	at org.springframework.cloud.contract.stubrunner.StubRunnerExecutor.sendMessage(StubRunnerExecutor.java:254)
	at org.springframework.cloud.contract.stubrunner.StubRunnerExecutor.triggerForDsls(StubRunnerExecutor.java:206)
	at org.springframework.cloud.contract.stubrunner.StubRunnerExecutor.trigger(StubRunnerExecutor.java:192)
	at org.springframework.cloud.contract.stubrunner.StubRunner.trigger(StubRunner.java:152)
	at org.springframework.cloud.contract.stubrunner.BatchStubRunner.trigger(BatchStubRunner.java:133)
	at uk.co.ii.staticinstrument.cucumber.CucumberStep.triggerFromStub(CucumberStep.java:113)
	at uk.co.ii.staticinstrument.cucumber.CucumberStep.whenATombstoneEventArrives(CucumberStep.java:97)
	at ✽.A tombstone event arrives(classpath:uk/co/ii/staticinstrument/cucumber/consumer.feature:5)

	private void sendMessage(Contract groovyDsl) {
		OutputMessage outputMessage = groovyDsl.getOutputMessage();
		DslProperty<?> body = outputMessage.getBody();
....

		Object payload = null;
		if (body.getClientValue() instanceof FromFileProperty) {