JasperReports 6.12.2. net.sf.jasperreports.engine.JRException: java.lang.NullPointerException

Hello! I try to make a graphic with Jasperrepport but i've got this message:

net.sf.jasperreports.engine.JRException: java.lang.NullPointerException
at com.jaspersoft.studio.editor.preview.view.control.ReportController.fillReport(ReportController.java:551)
at com.jaspersoft.studio.editor.preview.view.control.ReportController.access$18(ReportController.java:526)
at com.jaspersoft.studio.editor.preview.view.control.ReportController$1.run(ReportController.java:444)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.lang.NullPointerException
at net.sf.jasperreports.charts.fill.JRFillPieDataset.getCustomDataset(JRFillPieDataset.java:261)
at net.sf.jasperreports.engine.fill.JRFillChartDataset.getDataset(JRFillChartDataset.java:54)
at net.sf.jasperreports.engine.fill.JRFillChart$FillChartContext.getDataset(JRFillChart.java:1500)
at net.sf.jasperreports.engine.fill.DefaultChartTheme.getDataset(DefaultChartTheme.java:261)
at net.sf.jasperreports.engine.fill.DefaultChartTheme.createPieChart(DefaultChartTheme.java:1194)
at net.sf.jasperreports.engine.fill.DefaultChartTheme.createChart(DefaultChartTheme.java:358)
at net.sf.jasperreports.engine.fill.JRFillChart.evaluateChart(JRFillChart.java:845)
at net.sf.jasperreports.engine.fill.JRFillChart.evaluateRenderer(JRFillChart.java:798)
at net.sf.jasperreports.engine.fill.JRFillChart.resolveElement(JRFillChart.java:1406)
at net.sf.jasperreports.engine.fill.JRFillElement.performDelayedEvaluation(JRFillElement.java:1136)
at net.sf.jasperreports.engine.fill.JRFillElement.resolveElement(JRFillElement.java:1238)
at net.sf.jasperreports.engine.fill.ElementEvaluationAction.execute(ElementEvaluationAction.java:69)
at net.sf.jasperreports.engine.fill.DelayedFillActions.runActions(DelayedFillActions.java:271)
at net.sf.jasperreports.engine.fill.BaseReportFiller.resolveBoundElements(BaseReportFiller.java:807)
at net.sf.jasperreports.engine.fill.JRBaseFiller.resolveReportBoundElements(JRBaseFiller.java:1202)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillSummary(JRVerticalFiller.java:1223)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportEnd(JRVerticalFiller.java:297)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:117)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:615)
at net.sf.jasperreports.engine.fill.BaseFillHandle$ReportFill.run(BaseFillHandle.java:135)
at java.lang.Thread.run(Thread.java:748)

how can i resolve that?

Thanks