Refreshing sidebar: Cannot read property 'length' of undefined

Summary

Open "ISSUES AND MERGE REQUESTS"
Clicking on "GitLab: Refresh sidebar" causes error messages:

1. Failed to parse GitLab API response (Show logs)
2. e.filter is not a function

Relevant logs and/or screenshots

Cannot read property 'length' of undefined
TypeError: Cannot read property 'length' of undefined
  at Object.(anonymous) (C:\Users\...\gitlab_service.js:365:17)
  at Generator.next.(anonymous)
  at fulfilled (C:\Users\...\gitlab_service.js:7:58)
...

What is the expected correct behavior?

n/a

Version 3.9.0