security token was missing or mismatched.

[Battle_Ring]

One of my Admins gets this error when she tries to delete something

Your submission could not be processed because a security token was missing or mismatched.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.

Any idea what it is

[org knopper]

Here u go -

Implementing CSRF protection in modifications (https://vborg.vbsupport.ru/showthread.php?t=177013)

Ty.

[Dismounted]

Disable your modifications. If it works when they are disabled, then it is a problem with one of your modifications and you should seek help from the author.