[Iftop-users] cannot change the net filter code

Hi everybody. I am using iftop 0.17 on an openwrt router. It is really awesome. However I met the following annoying issue: in the main monitor screen of iftop, I press "f" to enter a filter, such as "not net myip". But if I made a typo, I found I could not use "backspace" on my keyboard to delete the typo.And later if I want to input a new filter, I press "f" again, then the command line on upper-left corner calls the old filter code and promoted me to input the new filter. Again, I cannot delete the old filter. I have to restart the iftop....

Is it a bug or something else? Thank you.

Peng