Servoy JasperReports Plugin

After upgrading to 3.1.0 final every runReport in webclient returns the following error (output type print, pdf)
Smartclient is ok.

Run from Servoy Developer 5.2.6

java.lang.NullPointerException
at net.sf.jasperreports.engine.util.JRLoader.loadBytes(JRLoader.java:329)
at net.sf.jasperreports.engine.util.JRLoader.loadBytesFromLocation(JRLoader.java:467)
at net.sf.jasperreports.engine.export.JRPdfExporter.getFont(JRPdfExporter.java:1876)
at net.sf.jasperreports.engine.export.JRPdfExporter.getChunk(JRPdfExporter.java:1690)
at net.sf.jasperreports.engine.export.JRPdfExporter.getPhrase(JRPdfExporter.java:1666)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportText(JRPdfExporter.java:2099)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportElements(JRPdfExporter.java:750)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportPage(JRPdfExporter.java:710)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportReportToStream(JRPdfExporter.java:599)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportReport(JRPdfExporter.java:360)
at com.servoy.plugins.jasperreports.JasperReportRunner.getJasperBytes(JasperReportRunner.java:205)
at com.servoy.plugins.jasperreports.JasperReportsProvider.runReport(JasperReportsProvider.java:514)
at com.servoy.plugins.jasperreports.JasperReportsProvider.js_runReport(JasperReportsProvider.java:369)
at com.servoy.plugins.jasperreports.JasperReportsProvider.js_runReport(JasperReportsProvider.java:362)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:179)
at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:353)
at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:3666)
at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2680)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:166)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:387)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3127)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:165)
at com.servoy.j2db.scripting.ScriptEngine.executeFunction(ScriptEngine.java:476)
at com.servoy.j2db.debug.RemoteDebugScriptEngine.executeFunction(RemoteDebugScriptEngine.java:382)
at com.servoy.j2db.plugins.ClientPluginAccessProvider$MethodExecutor.run(ClientPluginAccessProvider.java:511)
at com.servoy.j2db.server.headlessclient.WebClient.executeEvents(WebClient.java:460)
at com.servoy.j2db.debug.DebugWebClient.onBeginRequest(DebugWebClient.java:377)
at com.servoy.j2db.server.headlessclient.WebClientsApplication$6.onBeginRequest(WebClientsApplication.java:490)
at org.apache.wicket.RequestCycle.prepare(RequestCycle.java:1240)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1304)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)
at com.servoy.j2db.server.servlets.Zl.doGet(Zl.java:7)
at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:138)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:567)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)