code: private void resetStaticColumnsAfterRun() {
  		if (chart.getYColumnQuery() != null) {				
  			chart.setYColumns(new ArrayList<String>());
  			chart.setYColumnsLegends(new ArrayList<String>());
  		}
  	}
docs: after run we must delete static yColumns and yLegends (set with setDynamicColumns) from chart object