Hi there, we're encountering a crash on our server. Looks like a null exception involving concurrent access on a hashmap based on the line of the crash. Unfortunately I don't know much minecraft or java concurrency or else I'd just make a PR. I've attached a crash report
crash-2024-02-11_13.12.46-client.txt

We're running MC 1.20.1 via curseforge, also Create. The crash happens when a Create train activates a tiny redstone block with a panel.

I've posted a new version of the mod that will hopefully fix this issue (https://www.curseforge.com/minecraft/mc-mods/tiny-redstone/files/5189392). I can't verify 100%, because I was unable to reproduce, and the crash report appears to be incorrect about the line number where the crash occurs. There is no iterating happening at that point. I made some adjustments to that function where iteration is actually happening.

If you could test with this version and let me know what happens, I would be most grateful!

Thank you! I'll install the update on our server and report back if we still get the crash.

Fix back-ported to 1.19.2

Thanks for the report! I have a few questions.

This looks like a client side crash. Is the server also crashing?

According to the log, it looks like Create might be trying to do something with the VoxelShape at the same time that Tiny Redstone is attempting to update it. When you say "activates", do you mean it's just giving it a redstone signal, or is it trying to make it apart of a contraption?

Does this happen intermittently, or is it consistently repeatable?

When it gives it a redstone signal. Someone was using a Tiny Redstone component in a circuit that is activated when a train trips a train signal, which sends out a redstone pulse.

It did not crash the server, just the client, and it happened consistently