Problems with SonarCloud Analysis - getting NullPointerException

Dear SonarSource team,

first of all thanks for making SonarQube and SonarCloud that I generally like very much.
However, we currently struggle hard with our SonarCould Analysis that is failing for our github project with NPE

Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.7.0.1746:sonar (default-cli) on project devon4j: null: MojoExecutionException: NullPointerException -> [Help 1]

The error went away and now came back. Details:

I found this related stackoverflow thread:

However, I am unable to fix the error and get our sonarcloud analysis stable.
Do you have any clue for us before we have to give up?

Thank you so much in advance
Jörg