Picked up the star, server booted me. Re-entered server, entered the painting, server just booted me and shut down.
Crash log: https://mcpaste.io/c7284bb805dfc2c3

Was in creative mode at the time

Oh, and here's the server logs: https://mcpaste.io/8322c54e58cb79cf

Line 352 is where I log in, my character was still jumping at the Warp Painting, so it immediately tried to send me to the dimension and failed. This time I was in Survival, same results, different castle.

Can you check if this is fixed in the latest release?

It might be a separate issue, yeah. I just released another version, does it fix the other crash?

This update actually caused the server to fail on load. I tried it with and without other mods: https://mcpaste.io/55ac022a7cecea26

One other notable thing, It crashes when I pick up any loose item, not just the star. Come to think of it, this might be a separate issue?

0.0.5 should have both issues fixed

0.0.4 fixed Server Dimension Jumping... Testing 0.0.5 now

Excellent, 0.0.5 worked just fine, too! No problems travelling, no problems picking things up.