java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at annis.sqlgen.AnnotatedMatchIterator.setSpanForAllMatchedPositions(AnnotatedMatchIterator.java:122)
at annis.sqlgen.AnnotatedMatchIterator.next(AnnotatedMatchIterator.java:70)
at annis.sqlgen.AnnotatedMatchIterator.next(AnnotatedMatchIterator.java:33)
at annis.WekaHelper.exportArffHeader(WekaHelper.java:55)
at annis.dao.QueryDaoImpl$4.doInConnection(QueryDaoImpl.java:749)
at annis.dao.QueryDaoImpl$4.doInConnection(QueryDaoImpl.java:719)
at annis.dao.QueryDaoImpl.matrix(QueryDaoImpl.java:718)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)

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