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java.lang.NullPointerException: 	at org.codehaus.groovy.grails.orm.hibernate.metaclass.ExecuteUpdatePersistentMethod$1.doInHibernate(ExecuteUpdatePersistentMethod.java:93)	at org.codehaus.groovy.grails.orm.hibernate.GrailsHibernateTemplate.doExecute(GrailsHibernateTemplate.java:188)	at org.codehaus.groovy.grails.orm.hibernate.GrailsHibernateTemplate.execute(GrailsHibernateTemplate.java:132)	at org.codehaus.groovy.grails.orm.hibernate.metaclass.ExecuteUpdatePersistentMethod.doInvokeInternal(ExecuteUpdatePersistentMethod.java:70)	at org.codehaus.groovy.grails.orm.hibernate.metaclass.AbstractStaticPersistentMethod.invoke(AbstractStaticPersistentMethod.java:79)	at org.codehaus.groovy.grails.orm.hibernate.metaclass.AbstractStaticPersistentMethod.invoke(AbstractStaticPersistentMethod.java:72)	at org.codehaus.groovy.grails.orm.hibernate.HibernateGormStaticApi.executeUpdate(HibernateGormStaticApi.groovy:574)