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Cannot get property 'identifier' on null object
java.lang.NullPointerException: Cannot get property 'identifier' on null object	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:66)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)	at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)	at com.google.gson.Gson.toJson(Gson.java:586)	at com.google.gson.Gson.toJsonTree(Gson.java:479)	at com.google.gson.Gson$3.serialize(Gson.java:140)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:44)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:59)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)	at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)	at com.google.gson.Gson.toJson(Gson.java:586)	at com.google.gson.Gson.toJsonTree(Gson.java:479)	at com.google.gson.Gson$3.serialize(Gson.java:140)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:44)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:56)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)	at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)	at com.google.gson.Gson.toJson(Gson.java:586)	at com.google.gson.Gson.toJsonTree(Gson.java:479)	at com.google.gson.Gson$3.serialize(Gson.java:140)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:44)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:56)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)	at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)	at com.google.gson.Gson.toJson(Gson.java:586)	at com.google.gson.Gson.toJsonTree(Gson.java:479)	at com.google.gson.Gson$3.serialize(Gson.java:140)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:35)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:59)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)	at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)	at com.google.gson.Gson.toJson(Gson.java:586)	at com.google.gson.Gson.toJsonTree(Gson.java:479)	at com.google.gson.Gson$3.serialize(Gson.java:140)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_serialize_closure1.doCall(GrailsDomainSerializer.groovy:35)	at grails.plugin.gson.adapters.GrailsDomainSerializer$_eachUnvisitedProperty_closure2.doCall(GrailsDomainSerializer.groovy:56)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachProperty(GrailsDomainSerializer.groovy:70)	at grails.plugin.gson.adapters.GrailsDomainSerializer.eachUnvisitedProperty(GrailsDomainSerializer.groovy:51)	at grails.plugin.gson.adapters.GrailsDomainSerializer.serialize(GrailsDomainSerializer.groovy:27)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:70)	at com.google.gson.TreeTypeAdapter.write(TreeTypeAdapter.java:63)	at com.google.gson.Gson.toJson(Gson.java:586)	at com.google.gson.Gson.toJson(Gson.java:565)	at com.google.gson.Gson.toJson(Gson.java:540)	at grails.plugin.gson.converters.GSON.render(GSON.groovy:49)	at grails.plugin.gson.converters.GSON.render(GSON.groovy:58)	at grails.plugin.gson.api.ArtefactEnhancer$_enhanceControllers_closure1.doCall(ArtefactEnhancer.groovy:29)	at com.aire.pei.TestingController.gsontest(TestingController.groovy:166)	at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:195)	at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)	at org.apache.shiro.grails.SavedRequestFilter.doFilter(SavedRequestFilter.java:55)	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:380)	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)