Error on executing rhs mapping leaves submode

[nilsboy]

Given this submode definition:

call submode#enter_with('move', 'n', '', '<leader>m')
call submode#map('move', 'n', '', 'j', '<c-f>')
call submode#map('move', 'n', '', 'k', '<c-b>')

When I press j continuously in the submode until I reach the end of the file - submode exits when it is not possible to execute <c-f> anymore.

I would expect to stay in the submode no matter the error until I press the leave_with-key.

Could you look into this?
Thank you.

[hasufell]

Same here #35