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

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java.lang.NullPointerException:
at org.pentaho.python.PythonSession.rowsToPythonDataFrame(PythonSession.java:389)
at org.pentaho.di.trans.steps.cpythonscriptexecutor.CPythonScriptExecutor.rowsToPyDataFrame(CPythonScriptExecutor.java:458)
at org.pentaho.di.trans.steps.cpythonscriptexecutor.CPythonScriptExecutor.processBatch(CPythonScriptExecutor.java:276)
at org.pentaho.di.trans.steps.cpythonscriptexecutor.CPythonScriptExecutor.processRow(CPythonScriptExecutor.java:243)
at org.pentaho.di.trans.step.RunThread.run(RunThread.java:62)
at java.lang.Thread.run(Thread.java:745)

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