Error when maintaining Datasources & Drivers via Console

When opening 'Datasources & Drivers -> JDBC Drivers' an message is popping up saying that an internal error occured with Details "newValue is null"
After clicking the "+" to add a JDBC Driver I can add the JDBC driver indeed but the drivers are not showing up in the console.
When opening 'Datasources & Drivers -> Datasources' the datasources are listed correctly. But when trying to add another Datasource the same internal message is popping up and it ist not possible to add the Datasouce via Console