Error running fuzzy_navigator example

[megatux]

Entering some input on the filter, like "a" or "1" or actually anything I've tried, throws this error:

Filter: aUnhandled exception: Empty enumerable (Enumerable::EmptyError)
from ../../../.asdf/installs/crystal/0.35.1/share/crystal/src/enumerable.cr:502:13 in 'first'
from src/keimeno/menu.cr:95:21 in 'key_enter'
from demo/fuzzy_navigator.cr:28:5 in 'key_enter'
from src/keimeno/base.cr:92:5 in 'function_key'
from src/keimeno/base.cr:162:9 in 'key_pressed'
from src/keimeno/base.cr:189:9 in 'wait_for_input'
from src/keimeno/base.cr:53:9 in 'display_loop'
from src/keimeno/base.cr:30:11 in 'run'
from demo/fuzzy_navigator.cr:150:20 in '__crystal_main'
from ../../../.asdf/installs/crystal/0.35.1/share/crystal/src/crystal/main.cr:105:5 in 'main_user_code'
from ../../../.asdf/installs/crystal/0.35.1/share/crystal/src/crystal/main.cr:91:7 in 'main'
from ../../../.asdf/installs/crystal/0.35.1/share/crystal/src/crystal/main.cr:114:3 in 'main'
from __libc_start_main
from _start
from ???

Crystal info:

crystal -v
Crystal 0.35.1 [5999ae29b] (2020-06-19)

LLVM: 8.0.0
Default target: x86_64-unknown-linux-gnu

Commands to produce error:

$ crystal build demo/fuzzy_navigator.cr
$ ./fuzzy_navigator