`Error fetching the dashboard data...` on Security Dashboard

Summary

Error fetching the dashboard data. Please check your network connection and try again. after upgrade of gitlab.com to 12.0

Steps to reproduce

Run any pipeline on a project with some vulnerabilities. The vulnerabilities show up on the Pipeline > Security tab. But the Project > Security Dashboard shows the error message display above.

Example Project

https://gitlab.com/ps-cs-sk-demos/springsample/security/dashboard

Note that the project was created and worked on prior to 12.0 upgrade.

What is the current bug behavior?

Error displayed

What is the expected correct behavior?

Vulnerability data from the scans should be summarized.

Relevant logs and/or screenshots

None available

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Results of GitLab application Check

Possible fixes

Security Front End team needs to evaluate and fix the issue.