I set up a server with little tiles loaded and after restarting it and trying to interact with a specific door activator it kicked my off the server but left it running. I suspect that restarting the server while the door was mid animation corrupted the blocks. Fortunately, I found that breaking and replacing the tiles fixed the problem.

https://pastebin.com/Mua5Pns7

I'll close this for now. If it keeps happening, I'll reopen the issue.

According to your crash report, you're using an outdated version of both LittleTiles (you're using v1.5.0-pre150, we are at v1.5.0-pre158) and CreativeCore (you're using v1.9.54, we are at v1.9.62) . I suggest you update it and then check if the issue persists.

After updating the mod version I'm getting kicked ass soon as I load a chunk with little tiles blocks. Each time I loaded it created a different log every time. I'm not sure if this is entirely related but the affect is similar.
https://paste.dimdev.org/apesabimov.mccrash
https://paste.dimdev.org/ujivaxuwix.mccrash
https://paste.dimdev.org/ijesipogaw.mccrash
For now I'll keep using the previous version to avoid instant kicks

@Lucidcream you have to update CreativeCore.

and this issue as already been fixed in an unreleased version. I hope I can release it soon (it's been way to long)