ConcurrentModificationException in StepExecutionListener.saveCurrentResponseIfNeeded

Hi there,

Apologies if this has been asked before - I couldn't find a search 
feature for the mailing list.

When I run my suite of webtest tests, regularly one or more will fail 
with a ConcurrentModificationException, nearly always with the same 
stack trace:

Caused by: java.util.ConcurrentModificationException at 
java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) 
at java.util.AbstractList$Itr.next(AbstractList.java:343) at 
org.apache.commons.collections.set.ListOrderedSet$OrderedSetIterator.next(ListOrderedSet.java:302) 
at 
java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1008) 
at 
com.canoo.webtest.reporting.StepExecutionListener.saveCurrentResponseIfNeeded(StepExecutionListener.java:251) 
at 
com.canoo.webtest.reporting.StepExecutionListener.taskFinished(StepExecutionListener.java:180) 
at org.apache.tools.ant.Project.fireTaskFinished(Project.java:2206) at 
org.apache.tools.ant.Task.perform(Task.java:364) at 
com.canoo.webtest.steps.AbstractStepContainer.executeContainedStep(AbstractStepContainer.java:72) 
at 
com.canoo.webtest.steps.AbstractStepContainer.executeContainedSteps(AbstractStepContainer.java:80) 
at 
com.canoo.webtest.steps.control.GroupStep.doExecute(GroupStep.java:14) 
at com.canoo.webtest.steps.Step.execute(Step.java:102)

Different tests will fail with this randomly, which makes me think is a 
threading / race condition issue in webtest.  Is there a solution to 
this, or any way to stop it from happening?  I'm using R_1823

Thanks,
John.