Modpack version
1.66b Alpha.
Forge 1.12.2-14.23.5.2815. Twitch Launcer. Profile locked. memory settings unchanged. (basically everything standard)

Can the issue be reproduced?
Probably, but unknown, though i've done it in my world half a dozen times. Usually when have a full inventory worth of cobble. using jei to quick-craft 3 full stacks of compressed cobble, then quick-craft the second tier, then as many of the third tier as possible. about a 40% chance for crash.

Logs
https://pastebin.com/qx1c7Q3Y

Issue
Crashes client when crafting different varieties of compressed cobble (double, triple, quadruple). rendering issue crash within tinkers construct crafting station attached to other TC blocks.

The game crashed whilst rendering item
The game crashed whilst rendering item
Error: java.lang.NullPointerException: at index 0

automatic cobble gen nearby breaking blocks about 1/sec. nothing "taxing" tps wise as it's still pretty early in play.

If this is a feature request, feel free to delete the template.

U can disable the rendering of items in the TC config as a temp fix.

I recommend that you use a normal crafting table, or disconnect the Crafting Station from nearby inventories. I'm guessing it's simply being overloaded from too many crafts.

That being said, you're using outdated java, so you may be able to fix this issue by updating:

• Make sure you have the newest Java 8 64-bit installed on your PC
• Go to Twitch Settings and add -version:1.8+ to the Additional Arguments, or switch to the Jar Launcher, and then try again