So, Im playing on a private server, and I am making a service shop for the server. I go into a creative testing/ building world, and make a simple shop. And it crashes when loading. This also happens when loading an other schem as well. Here are two crash logs:

Single Player:
crash-2018-04-23_02.24.45-client.txt
crash-2018-04-23_02.40.37-client.txt

On the server:
crash-2018-04-23_02.34.57-client.txt

Any idea on what could be causing this?

Duplicate of #321; this is caused by optifine's Render Regions settings. Either remove optifine or disable that setting.

Would it be possible to pin that issue? So that no one needs to open another issue tracker?

I don't think GitHub lets you do that, but it might be possible to note it on the forum thread/the download page.

Yeah, Maybe a section with Known stuff like this.

Even if it was possible to pin issues, rarely anyone would read them. It's easier to close issues as duplicates.