openhabcloud.NotificationAction.sendBroadcastNotification(java.lang.String) on instance: null

Hi, I’m trying to debug this message:

An error occurred during the script execution: Could not invoke method: on instance: null

Once or twice a day a notification fails to be delivered and I find this message. I have enabled DEBUG level logging on but I’m not getting any more clues.

The only thing I have been able to establish is that failures seems to occur more often if the openhab is under “pressure”. I have started to remove rules that fire often and this seems to improve the situation…

Any ideas?