When calling a test case which dynamically adds a test step throws null pointer

Here is the scenario:
I have a test case 'A' that contains a groovy script that creates a test step and deletes it.
I have a test case 'B' that calls test case 'A'

If I run test case 'A' by itself, it works perfectly.
When I run test case 'B' I get a null pointer exception.


Line 66 of GetMedia below is: testRunner.testCase.insertTestStep( config, -1 )
Stack:
Tue Mar 02 11:07:42 PST 2010:ERROR:java.lang.NullPointerException
  java.lang.NullPointerException
  at com.eviware.soapui.model.tree.nodes.TestSuiteTreeNode$InternalTestSuiteListener.testStepAdded(TestSuiteTreeNode.java:131)
  at com.eviware.soapui.impl.wsdl.WsdlTestSuite.fireTestStepAdded(WsdlTestSuite.java:271)
  at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCase.insertTestStep(WsdlTestCase.java:500)
  at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCase.insertTestStep(WsdlTestCase.java:473)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:229)
  at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:52)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:129)
  at DeviceGateway.RichMedia_GetMedia(DeviceGateway:66)
  at DeviceGateway$RichMedia_GetMedia.callStatic(Unknown Source)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:48)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:167)
  at DeviceGateway.Search_ValidateImagesByRichMedia(DeviceGateway:449)
  at DeviceGateway$Search_ValidateImagesByRichMedia.call(Unknown Source)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:133)
  at Script1.run(Script1.groovy:1)
  at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:93)
  at com.eviware.soapui.support.scripting.groovy.SoapUIProGroovyScriptEngineFactory$SoapUIProGroovyScriptEngine.run(SourceFile:51)
  at com.eviware.soapui.impl.wsdl.teststeps.WsdlGroovyScriptTestStep.run(WsdlGroovyScriptTestStep.java:148)
  at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCaseRunner.runTestStep(WsdlTestCaseRunner.java:194)
  at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCaseRunner.internalRun(WsdlTestCaseRunner.java:125)
  at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCaseRunner.internalRun(WsdlTestCaseRunner.java:39)
  at com.eviware.soapui.impl.wsdl.support.AbstractTestRunner.run(AbstractTestRunner.java:138)
  at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
  at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
  at java.util.concurrent.FutureTask.run(Unknown Source)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  at java.lang.Thread.run(Unknown Source)

Thanks,

S