0scheduler.umd.js:9384 Uncaught TypeError: Cannot read property 'groupChildren' of null
at scheduler.umd.js:9384
at Array.forEach (<anonymous>)
at AjaxStore.prepareGroupRecords (scheduler.umd.js:9346)
at AjaxStore.afterPerformSort (scheduler.umd.js:10861)
at AjaxStore.performSort (scheduler.umd.js:10851)
at AjaxStore.performSort (scheduler.umd.js:1998)
at AjaxStore.sort (scheduler.umd.js:10693)
at AjaxStore.group (scheduler.umd.js:9462)
at MenuItem.onItem (scheduler.umd.js:71867)
at MenuItem.callback (scheduler.umd.js:389)
This column is not different other columns. It is a just string type and when I do group ascending by clicking on the column header. I see this. It's working fine with other columns.
I feel like this is the bug.