Hibernate errors when upgrading on HSQLDB

org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.xpn.xwiki.doc.XWikiAttachment.longSize
	at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:109)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:583)
	at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:229)
	at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3847)
	at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)
	at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:982)
	at org.hibernate.loader.Loader.doQuery(Loader.java:857)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
	at org.hibernate.loader.Loader.doList(Loader.java:2542)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
	at org.hibernate.loader.Loader.list(Loader.java:2271)
	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:459)
	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:365)
	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
	at com.xpn.xwiki.store.XWikiHibernateStore.loadAttachmentList(XWikiHibernateStore.java:1644)
	at com.xpn.xwiki.store.XWikiHibernateStore.loadXWikiDoc(XWikiHibernateStore.java:889)
	at com.xpn.xwiki.store.XWikiCacheStore.loadXWikiDoc(XWikiCacheStore.java:280)
	at com.xpn.xwiki.XWiki.getDocument(XWiki.java:1817)
	at com.xpn.xwiki.XWiki.getDocument(XWiki.java:1870)
	at com.xpn.xwiki.XWiki.getXClass(XWiki.java:6077)
	at com.xpn.xwiki.objects.classes.BaseClass.newCustomClassInstance(BaseClass.java:1072)
	at com.xpn.xwiki.store.XWikiHibernateStore.loadXWikiDoc(XWikiHibernateStore.java:936)
	at com.xpn.xwiki.store.XWikiCacheStore.loadXWikiDoc(XWikiCacheStore.java:280)
	at com.xpn.xwiki.XWiki.getDocument(XWiki.java:1817)
	at com.xpn.xwiki.XWiki.getDocument(XWiki.java:1870)
	at org.xwiki.extension.xar.internal.handler.packager.Packager.importDocumentToWiki(Packager.java:201)
	at org.xwiki.extension.xar.internal.handler.packager.Packager.importXARToWiki(Packager.java:169)
	at org.xwiki.extension.xar.internal.handler.packager.Packager.importXARToWiki(Packager.java:141)
	at org.xwiki.extension.xar.internal.handler.packager.Packager.importXAR(Packager.java:131)
	at org.xwiki.extension.xar.internal.handler.XarExtensionHandler.installInternal(XarExtensionHandler.java:207)
	at org.xwiki.extension.xar.internal.handler.XarExtensionHandler.upgrade(XarExtensionHandler.java:191)
	at org.xwiki.extension.handler.internal.DefaultExtensionHandlerManager.upgrade(DefaultExtensionHandlerManager.java:139)
	at org.xwiki.extension.job.internal.AbstractExtensionJob.installExtension(AbstractExtensionJob.java:325)
	at org.xwiki.extension.job.internal.AbstractExtensionJob.applyAction(AbstractExtensionJob.java:209)
	at org.xwiki.extension.job.internal.AbstractExtensionJob.applyActions(AbstractExtensionJob.java:157)
	at org.xwiki.extension.job.internal.InstallJob.runInternal(InstallJob.java:152)
	at org.xwiki.job.AbstractJob.runInContext(AbstractJob.java:206)
	at org.xwiki.job.AbstractJob.run(AbstractJob.java:189)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException
	at sun.reflect.GeneratedMethodAccessor213.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:66)
	... 42 more