ERROR [7624802@qtp0-9] (GrailsExceptionResolver.java:60) - java.lang.NullPointerException: Cannot invoke method keySet() on null object
org.codehaus.groovy.runtime.InvokerInvocationException: java.lang.NullPointerException: Cannot invoke method keySet() on null object
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:92)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:234)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1062)
	at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java:926)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:893)
	at groovy.lang.Closure.call(Closure.java:279)
	at groovy.lang.Closure.call(Closure.java:274)
	at org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsControllerHelper.handleAction(SimpleGrailsControllerHelper.java:368)
	at org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsControllerHelper.executeAction(SimpleGrailsControllerHelper.java:243)
	at org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsControllerHelper.handleURI(SimpleGrailsControllerHelper.java:203)
	at org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsControllerHelper.handleURI(SimpleGrailsControllerHelper.java:138)
	at org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController.handleRequest(SimpleGrailsController.java:88)
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
	at org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet.doDispatch(GrailsDispatcherServlet.java:264)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	...
Caused by: java.lang.NullPointerException: Cannot invoke method keySet() on null object
	at com.zeddware.grails.plugins.filterpane.FilterService$_filter_closure1_closure4.doCall(com.zeddware.grails.plugins.filterpane.FilterService:33)
	at com.zeddware.grails.plugins.filterpane.FilterService$_filter_closure1_closure4.doCall(com.zeddware.grails.plugins.filterpane.FilterService)
	at grails.orm.HibernateCriteriaBuilder.invokeClosureNode(HibernateCriteriaBuilder.java:1111)
	at grails.orm.HibernateCriteriaBuilder.invokeMethod(HibernateCriteriaBuilder.java:964)
	at com.zeddware.grails.plugins.filterpane.FilterService$_filter_closure1.doCall(com.zeddware.grails.plugins.filterpane.FilterService:30)
	at com.zeddware.grails.plugins.filterpane.FilterService$_filter_closure1.doCall(com.zeddware.grails.plugins.filterpane.FilterService)
	at grails.orm.HibernateCriteriaBuilder.invokeClosureNode(HibernateCriteriaBuilder.java:1111)
	at grails.orm.HibernateCriteriaBuilder.invokeMethod(HibernateCriteriaBuilder.java:890)
	at com.zeddware.grails.plugins.filterpane.FilterService.filter(com.zeddware.grails.plugins.filterpane.FilterService:127)
	at com.zeddware.grails.plugins.filterpane.FilterService.this$2$filter(com.zeddware.grails.plugins.filterpane.FilterService)
	...