Remove device error

Hello. While trying to remove old devices Traccar web console is throwing error: "Cannot read property 'forEach' of undefined" and removing operation is not possible. Please see capture:

https://www.dropbox.com/s/0b55r7imp236d49/remove-error.png?dl=0

I can create a new device and immediately remove it without problem.

What could be the reason for this?

Thanks in advanced

What version are you using?

Traccar version is: 3.11

It's a known issue in 3.11. You need to upgrade to the latest version.