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: (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