--- a/app/models/user.rb	2014-07-09 22:41:12.000000000 +0200
+++ b/app/models/user.rb	2017-03-03 13:31:36.000000000 +0100
@@ -490,7 +490,7 @@
     # No role on archived projects
     return roles if project.nil? || project.archived?
     if membership = membership(project)
-      roles = membership.roles
+      roles = membership.roles.uniq
     else
       roles << builtin_role
     end