How to get rid of annoying gnome-help due to unintentionally pressing F1

Ubuntu -
1. Go to System - Preferences - Keyboard Shortcuts
2. Create a new shortcut. Name it 'do nothing', and write 'false' (without quotes) in the "command" field. Push ok.
3. Scroll to the bottom of the list and find your new command. Click on the "Disabled", on the right, and push F1.