I have one issue in updating the instance settings.
The error comes like below when I am updating an instance setting in Liferay. It is an error like is null pointer exception please suggest any solution.
2020-03-26 06:51:13.317 ERROR [http-nio-8080-exec-1][PortletServlet:119] javax.portlet.PortletException: com.liferay.portal.kernel.exception.ModelListenerException: java.lang.NullPointerException
javax.portlet.PortletException: com.liferay.portal.kernel.exception.ModelListenerException: java.lang.NullPointerException
at com.liferay.portal.kernel.portlet.bridges.mvc.BaseMVCActionCommand.processAction(BaseMVCActionCommand.java:69)
at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.callActionMethod(MVCPortlet.java:378)
at com.liferay.portal.kernel.portlet.LiferayPortlet.processAction(LiferayPortlet.java:88)
at com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet.processAction(MVCPortlet.java:260)
at com.liferay.configuration.admin.web.internal.portlet.InstanceSettingsPortlet.processAction(InstanceSettingsPortlet.java:64)
at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:77)
at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:50)
at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:115)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153)
at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:62)
at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120)
at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48)
at com.liferay.portlet.internal.InvokerPortletImpl.invoke(InvokerPortletImpl.java:589)
at com.liferay.portlet.internal.InvokerPortletImpl.invokeAction(InvokerPortletImpl.java:632)
at com.liferay.portlet.internal.InvokerPortletImpl.processAction(InvokerPortletImpl.java:304)
at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.processAction(MonitoringInvokerPortlet.java:213)
at com.liferay.portlet.internal.PortletContainerImpl._processAction(PortletContainerImpl.java:521)
at com.liferay.portlet.internal.PortletContainerImpl.lambda$processAction$0(PortletContainerImpl.java:150)
at com.liferay.portlet.internal.PortletContainerImpl._preserveGroupIds(PortletContainerImpl.java:425)
at com.liferay.portlet.internal.PortletContainerImpl.processAction(PortletContainerImpl.java:143)
at com.liferay.portlet.SecurityPortletContainerWrapper.processAction(SecurityPortletContainerWrapper.java:93)
at com.liferay.portlet.RestrictPortletContainerWrapper.processAction(RestrictPortletContainerWrapper.java:76)
at com.liferay.portal.kernel.portlet.PortletContainerUtil.processAction(PortletContainerUtil.java:118)
at com.liferay.portal.action.LayoutAction.processLayout(LayoutAction.java:346)
at com.liferay.portal.action.LayoutAction.execute(LayoutAction.java:170)
at com.liferay.portal.struts.PortalRequestProcessor._process(PortalRequestProcessor.java:415)
at com.liferay.portal.struts.PortalRequestProcessor.process(PortalRequestProcessor.java:155)
at com.liferay.portal.internal.servlet.MainServlet.doPost(MainServlet.java:215)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at com.liferay.portal.internal.servlet.MainServlet.service(MainServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:124)
at com.liferay.portal.servlet.filters.password.modified.PasswordModifiedFilter.processFilter(PasswordModifiedFilter.java:62)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.secure.BaseAuthFilter.processFilter(BaseAuthFilter.java:357)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.monitoring.internal.servlet.filter.MonitoringFilter.processFilter(MonitoringFilter.java:182)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:104)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
at com.liferay.friendly.url.internal.servlet.FriendlyURLServlet.service(FriendlyURLServlet.java:409)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at com.liferay.portal.servlet.ServletAdapter.service(ServletAdapter.java:99)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:124)
at com.liferay.portal.kernel.servlet.BaseFilter.processFilter(BaseFilter.java:147)
at com.liferay.portal.servlet.filters.i18n.I18nFilter.processFilter(I18nFilter.java:368)
at com.liferay.portal.kernel.servlet.BaseFilter.doFilter(BaseFilter.java:49)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:215)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
