After error box I can't activate monster's effect, and make link monster

[大食いやろう]

1. Bug description
   [Describe what the bug is in your own words.]
   When i summon monster, error occur. After i check error box, monster (“Blazing Cartesia, the Virtuous” and black metal dragon) can’t activate their effect and can’t make link monster(“black metal dragon” to “striker dragon”).

2. Bug reproduction steps
   Monster which make error is “Blazing Cartesia, the Virtuous” and “black metal dragon”.
   [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]

   Spoiler

   your replay code

3. Screenshot OR error code
   ? attempt to call a nil value [field’GetMustMaterial’]

4. Expected behavior
   [Tell us what should have happened when the bug occurred.]
   Please tell me how to fix this bug.

5. What OS are you using
   [Windows-10 / Linux / Android]
   Windows-10

[Lyris]

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