java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.pentaho.di.trans.steps.concatfields.ConcatFields.prepareOutputRow(ConcatFields.java:259)
at org.pentaho.di.trans.steps.concatfields.ConcatFields.putRowFromStream(ConcatFields.java:186)
at org.pentaho.di.trans.steps.concatfields.ConcatFields.processRow(ConcatFields.java:93)
at org.pentaho.di.trans.step.RunThread.run(RunThread.java:50)
at java.lang.Thread.run(Unknown Source)

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