JavaScript step issue: No Context associated with current thread

[mattcasters]

When streaming data on DataFlow, the other engines don't seem to be affected...

...
	at org.apache.beam.runners.dataflow.worker.BatchDataflowWorker.doWork(BatchDataflowWorker.java:380)
	at org.apache.beam.runners.dataflow.worker.BatchDataflowWorker.getAndPerformWork(BatchDataflowWorker.java:306)
	at org.apache.beam.runners.dataflow.worker.DataflowBatchWorkerHarness$WorkerThread.doWork(DataflowBatchWorkerHarness.java:135)
	at org.apache.beam.runners.dataflow.worker.DataflowBatchWorkerHarness$WorkerThread.call(DataflowBatchWorkerHarness.java:115)
	at org.apache.beam.runners.dataflow.worker.DataflowBatchWorkerHarness$WorkerThread.call(DataflowBatchWorkerHarness.java:102)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.pentaho.di.core.exception.KettleValueException: 
Unexpected error
No Context associated with current Thread

	at org.pentaho.di.trans.steps.scriptvalues_mod.ScriptValuesMod.addValues(ScriptValuesMod.java:384)
	... 63 more
Caused by: java.lang.RuntimeException: No Context associated with current Thread
	at org.mozilla.javascript.Context.getContext(Context.java:2355)
	at org.mozilla.javascript.ScriptRuntime.toObject(ScriptRuntime.java:963)
	at org.mozilla.javascript.Context.toObject(Context.java:1660)
	at org.pentaho.di.trans.steps.scriptvalues_mod.ScriptValuesMod.addValues(ScriptValuesMod.java:355)
	... 63 more