Custom event template doesn't work with multiple resources

Question

I get an error when hitting the save button on a custom editor with multiple resources.

"ERROR

Error: Cannot read property 'GroupID' of undefined"

It is crudely demonstrated at this stackblitz https://stackblitz.com/edit/angular-bcvhfv

Karthigeyan Krishnamurthi · Answer

Hi Mike, 
 
Thank you for contacting Syncfusion support. 
 
In the provided sample, custom window fields are not properly initiated which is the cause for the issue. We have modified your sample which can be referred from the below link. 
https://stackblitz.com/edit/angular-bcvhfv-htuj6t?file=timeline-resource.component.ts 
 
 
Regards, 
Karthigeyan