Description of the Bug
When using the Sequential Fabricator with a Railcraft recipe, the server crashes after a random time of work... Currently tried the Wooden Tie and the Infernal Block recipes.

To Reproduce

1. Place and setup a Railcraft recipe in the Sequential Fabricator,
2. Let it run for a moment,
3. The server crashes...

Expected behavior
Avoid to crash the server.

Screenshots & Video
This is the recipe I used.

Logs & Environment

• Full log:
  none, too long for Gist
• Crash report:
  crash-2019-04-10_14.45.50-server.txt

Additional context
Railcraft version: 12.0.0