Machina Citadel input value nil

[Autarch]

1. Bug description
   When Machina citadel is in the graveyard and a machine monster is destroyed, normally Machina citadel would special summon from the GY as the result of a machine monster being destroyed, instead the option to special summon Machina citadel is replaced with an error reporting an input value of nil.

2. Bug reproduction steps

   [Write the exact steps to reproduce the bug. Provide a replay code if you can. You can attach replay codes, or use a pastebin link or you can even use a spoiler tag using]
   Send Machina Citadel to Gy or have Machina Citadel in GY, then destroy one of your own machine monsters on your side of the field, this will create the error input value nil,

3. Screenshot OR error code

4. Expected behavior
   When a Machine monster is destroyed while Machina citadel is in GY, Machina Citadel should be able to be special summoned from the machine monster being destroyed.

5. If you have issues with connecting, please attach your Player.log file (Find this file in %userprofile%/AppData/LocalLow/Duelists Unite/YGO Omega/Player.log. Skip this step if you don’t have connection issues)

[AntiMetaman]

Fixed.