result.responseJSON is undefined

[solracsf]

Some users i try to impersonate in my test instance return this in the browser (Firefox) console, as other works without problems.

TypeError: result.responseJSON is undefined @ impersonate.js:12:5
    impersonate https://example.com/apps/impersonate/js/impersonate.js?v=1504f9c4-9:12
    u https://example.com/core/js/dist/main.js?v=1504f9c4-9:39
    fireWith https://example.com/core/js/dist/main.js?v=1504f9c4-9:39
    k https://example.com/core/js/dist/main.js?v=1504f9c4-9:39
    t https://example.com/core/js/dist/main.js?v=1504f9c4-9:39

[blizzz]

Can you please describe what exactly happens? What's the Nextcloud version, which backend is the target user from?

[solracsf]

NC 16.0.4.1, all user backends are the same.
This happens once i click YES on the pop-up window.

Nothing happens, only the console error.
For other user, no error, and user is impersonated.

[blizzz]

You say it happens for some users. Is there any thing in common with those where it does not work (compared to those where it does)? They logged in before, right?

[solracsf]

They logged in before, right?
Can't answer that, is there any way on the interface to know it?

[blizzz]

on the users page, click on settings on the bottom left and check "Show last login".

[solracsf]

You're right, users have never logged in.
Can the impersonate option be hidden on this specific case, or show a message like "User has never logged in, it can't be impersonated"?

[blizzz]

In that case, impersonating should not work at all actually and a warning be displayed. Already.

[blizzz]

Are those all users from the local backend or a different one?

[solracsf]

Local (database) only.

[solracsf]

Closing as fixed.