Backspace in empty tag removes previous tag

Very easy to lose tags this way. Say you have a few tags for a word, then you start entering a new tag and decide to backspace over it. If you happen to hit backspace while in the first position of the now empty tag (easy to do when you’re blindly backspacing to erase and start over), instead of doing nothing, it deletes the previous tag permanently…and unless you were paying attention, you don’t even know what that tag was. It should hit a back-stop, per se, so that further backspacing does nothing, as per normal edit box behavior…right?. (web interface)