WsdlTestCaseRunner null pointer exception version 2.7.0

The following Script worked fine in 2.6.0 but since upgrading to 2.7.0

 

 

def groovyUtils = new com.eviware.soapui.support.GroovyUtils( context );
def testCase = testRunner.testCase;
def testStep1 = testCase.getTestStepByName("Check Quote Processed");
testRunner = new com.eviware.soapui.impl.wsdl.testcase.WsdlTestCaseRunner(testCase, null);
testStepContext1 = new com.eviware.soapui.impl.wsdl.testcase.WsdlTestRunContext(testStep1);

def result = context.expand( '${Check Quote Processed#ResponseAsXml#//Results[1]/ResultSet[1]/Row[1]/BATCHPROCESSINGSTATUSID[1]}' )
def count = 0

while (result != "1") {
	  	log.warn(result, result)
		testStep1.run(testRunner, testStepContext1);
		result = context.expand( '${Check Quote Processed#ResponseAsXml#//Results[1]/ResultSet[1]/Row[1]/BATCHPROCESSINGSTATUSID[1]}' )
		sleep(5000);
		count = count + 1;
		if (count == 10) {
			break;
		}		
}
assert result == "1"
log.warn(result, result)

Specifically now 

testRunner = new com.eviware.soapui.impl.wsdl.testcase.WsdlTestCaseRunner(testCase, null);

Gives a NullPointerException.

WsdlTestCaseRunner(WsdlTestCase testCase, StringToObjectMap properties) 

StringToObjectMap allows null

 

Any advice?