$by_event_type projection failing

Hi,

eventstore 4.1.3.0

our $by_event_type projection is failing, when editing it from the UI, it contains a single word ‘yes’

on our test environment and local dev’s environment, it is empty.

I’m assuming someone typed it in (thinking he was in another window) and saved it,

unfortunately, I’m unable to undo it, (removing the word and saving the projection does not work, probably some javascript validation)

Is there another way to restore it to working order?

thx,

Gertjan