Argument Error on :ets.lookup in ReleaseReader

[schnittchen]

Hello,

I'm seeing these regularly in CI:

     ** (ArgumentError) argument error
     stacktrace:
       (stdlib) :ets.lookup(:tzdata_rel_2019a, :zone_and_link_list)
       (tzdata) lib/tzdata/release_reader.ex:16: Tzdata.ReleaseReader.simple_lookup/1
       (tzdata) lib/tzdata/release_reader.ex:9: Tzdata.ReleaseReader.zone_and_link_list/0
       (tzdata) lib/tzdata.ex:61: Tzdata.zone_exists?/1
       (timex) lib/timezone/timezone.ex:358: Timex.Timezone.resolve/3
       (timex) lib/timezone/timezone.ex:526: Timex.Timezone.convert/2

Versions:

Erlang/OTP 21 [erts-10.3.5.5] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]
Interactive Elixir (1.8.2) - press Ctrl+C to exit (type h() ENTER for help)
tzdata version "1.0.1"