Alexa Skill > if Items have no value all is working, if RestoreOnStartup worked, no right feedback

Hello, I have since a long time an issue and I can’t find out what the issue is.

Sometimes my OpenHab (2.3.0) is not reloading the historic values from the rrd4j & mapdb Database.

If the values are not loaded, the Alexa Skill is working perfect.

“Echo please change the temp in bedroom to 21.5°”

The feedback is, changed the temp to 21.5 °C

When the items are loaded correctly, I get as answer:

Es ist ausgestellt

But Alexa is changing the items to the requested value.

Does anybody have an idea how this is happen?