Deleting filter = scrum board vanishes! ... Surely not?

One of our scrum masters was tidying up his filters, and deleted several, one of which was in use by his scrum team's board.

This resulted in the board vanishing! Why was this allowed to happen? Surely some sort of warning or prevention could have been done by the system?

Our only fix was to recreate the board, and go through the settings to put everything back as it was. Not an easy time when you have developers in 2 countries trying to use the boards!

Please do something to prevent boards disappearing in this way.