Issue

Impacted version: v0.62

Server Setup Information:

• Operating System: Red Hat Enterprise Linux 7.4
• Deployment Method(tar/sandstorm/snap/docker/etc /http frontend (nginx, httpd, ...)): 6x tar with Nginx frontend
• Node Version: v4.8.5
• MongoDB Version: v3.2.10
• ROOT_URL environment variable (Is there a subfolder?): https://wekan.internal.domain.name/

Problem description:
It is not possible to set "Members" for any card inside 1 board. This appears to only impact one of our boards. I have checked the board data in MongoDB and it appears to be sane.
The process being followed is to create a card, then click on the created card and try to add a member to the card. When selecting a board member from the list the member has a tick next to their avatar for half a second before the tick disappears and there is no avatar shown in the "Members" section. The attempt to add the user to the card is recorded and shown in the Activity list.

The console prints the following error at this time:
update failed: Error at y._livedata_result (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:83:22762) at o (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:83:8184) at https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:83:1063 at Array.forEach (native) at Function.A.each.A.forEach (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:1:854) at C.t.socket.onmessage (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:83:1021) at C.o.dispatchEvent (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:82:1501) at C._dispatchMessage (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:82:15091) at C._didMessage (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:82:15977) at WebSocket.o.ws.onmessage (https://wekan/dbd05c640f0d684fd0eab9118e8d2e09a3c6270f.js?meteor_js_resource=true:82:18075)

Process screenshots below: