NPE in console: http://pastebin.com/TczuUF0c
Crash log that follows: http://pastebin.com/A1LjP7ee

This issue is next on my todo-list, so this solution should only be temporary.

@Claycorp agreed

I noticed this mostly when I was trying to move too fast, such as running, or using a boat

Could be caused by a network extending into multiple chunks.

@BiatuAutMiahn Any information on what the network that causes the crash looks like could help. I/f you have some pictures with chunk boundaries, that'd be great.

I used to get this alot too, my solution was to increase the view distance in the server.properties to double the view distance of my client. ie: ServerVD: 32 if ClientVD: 16. Afterwards I was able to go all over the map without crash

That might work for small servers of a handful of people but i'm not going to let 20+ people onto a server with a view distance of 32.... It's not a viable solution to the issue.

Here's a screenshot of what we had that crashed. Sadly there's no chunk boundaries but it spans multiple chunks and it never would fail in the same spot. http://imgur.com/DaARbhG

I can confirm that #20 is caused by chunks being unloaded. A few times now id dump items into my inventory system, and leave (about 1024+ blocks away) upon coming back the network is locked up.

Edit: Wrench is the only temporary fix.

@Claycorp, what are those blocks with the red lines?

Actually additions laser power relays.

Still happening with the new Integrated Dynamics: https://hastebin.com/oteqomubes.pas

@Rubbertjuh Any other details you can give me? Does this also occur on chunks unloading?

I've managed to reproduce it myself as well, fixing it as we speak.

Can confirm that my server is having these crashes as well, Sky Factory 3 modpack.

Will be fixed with the next Integrated Dynamics update.

This happened just after server startup, so not chunk unloading. That's pretty much all the details that I know off and that I can give =/ Sorry.

@Rubbertjuh I can't reproduce this myself, but I pushed a small change that may resolve your crash. Could you test this on your server?

Considering this resolved, @Rubbertjuh, let me know if this is not the case.