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TypeError: Cannot read properties of null (reading 'children') at e.dialogButtonClick

Hello,

Hope you are doing well.

We are currently evaluating your product, especially the Kanban component, and we are getting a error when updating the cards in Kanban (added GIF in attachments)

We need to update the cards so that the information is up to date for the end users, however it seems that when we use the updateCard -method (https://ej2.syncfusion.com/documentation/api/kanban/#updatecard) we get an "TypeError: Cannot read properties of null (reading 'children') at e.dialogButtonClick" and the changes will not come to effect.

Is there a issue in the SyncFusion library or in the JavaScript logic I have made? 

JSFiddle: https://jsfiddle.net/mL2ytbgp/2/