Device-queue item error

ChirpStack Network Server
1

Hi
I have the following error in my NS logs. It is occurring for a number of my devices.

Am I right in assuming the “object” the message refers to is an item in the device queue? If so what causes this error?

My nodes are all Class-C and messages are therefore sent from ChirpStack. I use confirmed messages.

level=error msg=“get device-queue item error” ctx_id=f3d4ea8c-4b5e-461b-95ff-4b24bf4247d1 dev_eui=70b3d5499e320cda error=“object does not exist”

Thanks for any pointers.

regards
Alan