Upgrade SonarQube version 6.7.2 (build 37468) to version 7.9.1 failed in migration step

Hi,

Welcome to the community. As discussed here:

This error is caused by the presence in your database of projects that have not been analyzed since 5.6. You should either analyze those projects via a restored 6.7.2 before upgrade, or delete them.

 
HTH,
Ann