Pressing backspace or letter which is not in results breaks it.

[krasa]

for example: results are A - D, press H, nothing happens => no more jumping, you have to ESC and try it again.
find something, press backspace, find something else => cannot jump on it

[johnlindquist]

Ok, I'll look into guarding against mistypes.

[ErikRoelofs]

If you're going to guard against mistypes; I've noticed that this also pops up when you use Ctrl+a letter. Could you guard against that as well?
(Still getting used to the plugin, so I thought it was just broken because after you accidentally ctrl+letter it stops working as described in other issues)

Other than that I love this plugin :)

[breandan]

Backspace now resets AceJump to the initial state in AceJump 3.0 Beta, removing any mistypes. Feel free to give it a try and report any issues you encounter. Thanks!