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"An error occurred while fetching participants." when clicking on board card item

Summary

When the sidebar is expanded in issue boards, an error message is flashed "An error occurred while fetching participants."

Screen_Recording_2021-05-03_at_2.08.27_PM

Steps to reproduce

⚠ The error could not be reproduced elsewhere including on staging, local env, or plan-stage:

Example Project

Visit the group or project issue boards for gitlab-org:

Group boards: https://gitlab.com/groups/gitlab-org/-/boards

Project boards: https://gitlab.com/gitlab-org/gitlab/-/boards

What is causing the error?

The following query used in the assignee widget component is returning null as nodes:

usersSearchQuery 

query usersSearch($search: String!, $fullPath: ID!) {
  workspace: project(fullPath: $fullPath) {
    users: projectMembers(search: $search, relations: [DIRECT, INHERITED, INVITED_GROUPS]) {
      nodes {
        user {
            id
  	    avatarUrl
  	    name
  	    username
  	    webUrl
        }
      }
    }
  }
}

// arguments
{
  "first": 20,
  "fullPath": "gitlab-org/gitlab",
   "search": ""
}

Query response

{
  "data": {
    "workspace": {
      "users": {
        "nodes": [
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          {
            "user": {
              "id": "gid://gitlab/User/8802897",
              "avatarUrl": "https://secure.gravatar.com/avatar/be3664e0a2e10d06d5d9bcb979ef3fa9?s=80&d=identicon",
              "name": "Louis Vasquez",
              "username": "Lvasquez00887",
              "webUrl": "https://gitlab.com/Lvasquez00887"
            }
          },
          ...

Possible fixes

Needs more investigation from the backend side.

Possible temporary workaround on frontend

  • Removing INVITED_GROUP in the usersSearch query removes the null nodes
Edited by euko