Boards throw 500 error after upgrade to 10.2.1

Summary

When access the boards for all the projects, it throws 500 error.

Example Project

Self hosted EES.

What is the current bug behavior?

Click on Boards under issues, page error 500 loads.

What is the expected correct behavior?

Load boards page.

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:		
Proxy:		no
Current User:	git
Using RVM:	no
Ruby Version:	2.3.5p376
Gem Version:	2.6.13
Bundler Version:1.13.7
Rake Version:	12.1.0
Redis Version:	3.2.5
Git Version:	2.13.6
Sidekiq Version:5.0.4
Go Version:	unknown
GitLab information
Version:	10.2.1-ee
Revision:	37e4726
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	postgresql
DB Version:	9.6.5
URL:		tttt
HTTP Clone URL:	ttttt
SSH Clone URL:	ttttt
Elasticsearch:	no
Geo:		no
Using LDAP:	no
Using Omniauth:	no
GitLab Shell
Version:	5.9.4
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git