The addPersistenceService method has thrown an exception

Hi,

I’ve been running OH2 on a Raspberry Pi for a few months and a couple of days ago I added the InfluxDB binding. After a day I noticed that data was missing in Influx and also in MySQL so I checked the logs and found this:

2018-10-19 07:33:38.127 [ERROR] [sql.internal.MysqlPersistenceService] - mySQL: Error running querying :
2018-10-19 07:29:00.882 [ERROR] [g.eclipse.smarthome.core.persistence] - [org.eclipse.smarthome.core.persistence.internal.PersistenceManagerImpl(68)] The addPersistenceService method has thrown an exception
java.lang.NullPointerException: null

Since then I’ve tried to restart OH, uninstall Influx binding, reinstalled MySQL binding and still the error persists.

I see data in MySQL as I expect (at least when I recently checked) but why do I get this error message?
Is this an actual error or can I safely ignore it?

Many thanks in advance.
/Freddy