diff --git a/website/server/models/group.js b/website/server/models/group.js
index 6ca51cc955..143394eb89 100644
--- a/website/server/models/group.js
+++ b/website/server/models/group.js
@@ -1432,11 +1432,6 @@ schema.methods.syncTask = async function groupSyncTask (taskToSync, users, assig
       completed: false,
     };
 
-    if (!taskToSync.group.assignedUsers) {
-      taskToSync.group.assignedUsers = [];
-    }
-    taskToSync.group.assignedUsers.push(user._id);
-
     if (!taskToSync.group.assignedUsersDetail) {
       taskToSync.group.assignedUsersDetail = {};
     }
@@ -1445,6 +1440,8 @@ schema.methods.syncTask = async function groupSyncTask (taskToSync, users, assig
     }
     taskToSync.markModified('group.assignedUsersDetail');
 
+    taskToSync.group.assignedUsers = _.keys(taskToSync.group.assignedUsersDetail);
+
     // Sync tags
     const userTags = user.tags;
     const i = _.findIndex(userTags, { id: group._id });