What does this status of the QBM_PDBQueueProcess mean?

Hello,

We are currently using version 8.0.5 of the Identity Manager.

In the system log we noticed entries of the application QBM_PDBQueueProcess which contain the following MessageString invalid RunningState -1.

What does this mean? What could have caused this message?
So far I couldn't find much in my research on this, which is why I'm posting this question to the forum now.

Thanks a lot for your hints.

Kind regards