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java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)	at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:583)	at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:566)	at com.google.common.collect.ImmutableCollection$Builder.addAll(ImmutableCollection.java:324)	at com.google.common.collect.ImmutableList$Builder.addAll(ImmutableList.java:600)	at com.atlassian.confluence.api.model.reference.ModelListBuilder.putAll(ModelListBuilder.java:113)	at com.atlassian.confluence.api.model.content.Content$ContentBuilder.ancestors(Content.java:612)	at com.atlassian.confluence.api.impl.service.content.factory.ContentFactory.buildFromContentConvertible(ContentFactory.java:122)	at com.atlassian.confluence.api.impl.service.content.factory.ContentFactory.buildFrom(ContentFactory.java:105)	at com.atlassian.confluence.api.impl.service.content.ContentServiceImpl.updateUsingApiSupport(ContentServiceImpl.java:128)	at com.atlassian.confluence.api.impl.service.content.ContentServiceImpl.update(ContentServiceImpl.java:176)	at sun.reflect.GeneratedMethodAccessor2672.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at com.sun.proxy.$Proxy154.update(Unknown Source)	at com.atlassian.confluence.api.impl.service.content.draft.LegacyContentDraftServiceImpl.publishEditDraft(LegacyContentDraftServiceImpl.java:54)	at com.atlassian.confluence.api.impl.service.content.draft.ContentDraftServiceImpl.publishEditDraft(ContentDraftServiceImpl.java:36)