Command completion stopped working after update to 0.2.10

env RUST_BACKTRACE=full prs internal completions fish
Generating completions for fish...thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /home/xengi/.cargo/registry/src/github.com-1ecc6299db9ec823/clap_generate-3.0.0-beta.2/src/lib.rs:132:53
stack backtrace:
   0:     0x560326416700 - <unknown>
   1:     0x56032643be2c - <unknown>
   2:     0x5603264118e2 - <unknown>
   3:     0x560326418f75 - <unknown>
   4:     0x560326418ad3 - <unknown>
   5:     0x560326419711 - <unknown>
   6:     0x560326419227 - <unknown>
   7:     0x560326416b9c - <unknown>
   8:     0x5603264191b9 - <unknown>
   9:     0x56032643a541 - <unknown>
  10:     0x56032643a48d - <unknown>
  11:     0x5603260cdc69 - <unknown>
  12:     0x5603260dfae5 - <unknown>
  13:     0x5603260c2735 - <unknown>
  14:     0x5603260cbf43 - <unknown>
  15:     0x560326097026 - <unknown>
  16:     0x5603260993f3 - <unknown>
  17:     0x560326099409 - <unknown>
  18:     0x560326419c27 - <unknown>
  19:     0x5603260992f2 - <unknown>
  20:     0x7f2eb5286b25 - __libc_start_main
  21:     0x56032607608e - <unknown>
  22:                0x0 - <unknown>