Uncaught TypeError: Cannot read property 'isSynchronized' of undefined
问题 I have a problem with sorting my ExtJS grid. I'm using Ext JS version 5.1.1.451. The grid loads well but when I try to sort the columns I get the "Uncaught TypeError: Cannot read property 'isSynchronized' of undefined" error. The method addCls is triggered on mouse movement and when the error occures, me.getData() returns undefined , where me is constructor $observableInitialized: true component: constructor config: Object destroy: () {} dom: null el: null events: Object hasListeners: statics