Erro - java.lang.NumberFormatException: For input string: JSF com PrimeFaces

Bom galera estou com seguinte problema, na minha HTML estou usando o Combobox que carrega funcionarios no banco, neste combobox tenho 1 item que se chama --Selecione–, só que não permite salvar este item, só que quando seleciono ele aparece um Erro.

`

<p:selectOneMenu value="#{cadastroAgenda.agendamento.funcionario}"
            required="true" id="func" label="Funcionario" converter="conversorFuncionario">
	     <f:selectItem itemLabel="---Selecione---" noSelectionOption="true" />
						
	     <f:selectItems value="#{cadastroAgenda.listfuncionarios}"
	        var="funcionario" itemLabel="#{funcionario.funcNome}"
	        itemValue="#{funcionario}" />
	</p:selectOneMenu>

`

java.lang.NumberFormatException: For input string: "---Selecione---" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Integer.parseInt(Integer.java:580) at java.lang.Integer.<init>(Integer.java:867) at converters.FuncionarioConverter.getAsObject(FuncionarioConverter.java:36) at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:171) at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:201) at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:318) at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.getConvertedValue(SelectOneMenuRenderer.java:60) at javax.faces.component.UIInput.getConvertedValue(UIInput.java:1045) at javax.faces.component.UIInput.validate(UIInput.java:975) at javax.faces.component.UIInput.executeValidate(UIInput.java:1248) at javax.faces.component.UIInput.processValidators(UIInput.java:712) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1260) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1260) at org.primefaces.util.ComponentUtils.processValidatorsOfFacetsAndChilds(ComponentUtils.java:266) at org.primefaces.component.api.UITabPanel.processValidators(UITabPanel.java:1073) at javax.faces.component.UIForm.processValidators(UIForm.java:253) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1260) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1260) at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1195) at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at util.HibernateSessionFilter.doFilter(HibernateSessionFilter.java:38) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)