Sprites sometimes miss a champion

[Ilshidur]

The champion sprites sometimes miss the last champion (last released).

e.g. : https://lol-item-sets-generator.org/sets/597848171a9c4f250017d0b8 (misses Kayn)

[Ilshidur]

This might be the issue :

[...]
[GENERATOR] Generating the ChampionIcon sprites ...
  league-sprites Initializing a new generator ... +0ms
  league-sprites Initializing API +3ms
  league-sprites Initialized API +542ms
  league-sprites Initializing a new generator : done ! +1ms
  league-sprites Generating ... +6ms
  league-sprites Requesting 'ChampionIcon' data ... +6ms
  league-sprites Requesting champions icons ... +2ms
  league-sprites Got 137 requests to execute. Executing ... +834ms
  league-sprites Requests executed. Saving the images ... +2s
  league-sprites Saving images to output/sprites_download/ChampionIcon ... +2ms
  league-sprites Saving images : done ! +103ms
  league-sprites 137 images downloaded ! +10ms
  league-sprites Generating sprite sheet from output/sprites_download/ChampionIcon/*.png to output/sprites_uncompressed/champions.png (css : output/sprites/champions.css) ... +4ms
Shutting down MongoDB connection ...
Shuting down Kue ...
Exiting ...

The sprites generator closes early, maybe because of a non-handled internal error.