Thanks J.D. for your reply. In the meanwhile i found another solution for my problem.
Every efort to get it to work with “async-await” did not work. I also tried your suggestion. Perhaps the error was also caused by some other code-snipet, although i am sure, i have deactivated all the other codes, to figure out the problem.
I solved it by using —> then() and a changed code-structure. It works again, but my mission is still not complete 
This is what i am working on…
https://www.media-junkie.com/pflegeservice
I am trying to generate a SUPER-FILTER-ENGINE 