Game crash

[Sencres]

REVIEW THE GUIDELINES - see Contributing link on right side.

Minecraft version: 1.12.2
Galacticraft version ("latest" is not a valid option): 4.0.2.280

Single player (SP), Multiplayer (MP), or SP opened to LAN (LAN)? SP

• If MP server, please mention if it has Sponge, AtomMC, BukkitForge, BungeeCord etc.

Any Galacticraft add-ons installed? Please list all of them: None

Please upload crash report / full log to Github Gist or any other paste site: https://pastebin.com/WFXY3mZB
https://streamable.com/8v463k

Please provide screenshots / videos / full modlist as needed

Please state the site that you downloaded Galacticraft from: http://micdoodle8.com/mods/galacticraft/downloads

When I get a for an example, dark decoration block slab, If i place two of them to get a full block, I pick the block in creative, and when I place it the game crashes. This of course isn't limited to the dark decoration block slab.