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Issue description:

Player logs in, they crash, another play logs in same base, they crash.

Steps to reproduce:

1. Asking players if they can make it happen in single player.

Version (make sure you are on the latest version before reporting):

In the crashlog.

If a (crash)log is relevant for this issue, link it here: (It's almost always relevant)

Player 1- https://pastebin.com/SBwjzEZ2
Player 2- https://pastebin.com/cCV01H8T

Could you let the players try without foamfix?

There's somehow an issue that there is either no blockstate for the block, or the blockstate doesn't have a color property set.

We should still be checking for nulls in IExtendedBlockState. I have a very similar issue open on Applied Llamagistics.

Unlike a normal state, it is completely valid for IExtendedBlockState to be missing a value for an unlisted property, getValue will just return null. In the glow panel's case it can happen if the TE is null for whatever reason.

I've found BlockState related crashes can happen with using "builder's wands" to place things (No idea which one the user on my server had used when the similar crash happened with ProjectRed stuff)

After using cofh to clear them-
/cofh clearblocks -1654 10 -4236 -1854 120 -4436 Mekanism:glowpanel

I now get this client crash when going there.
https://gist.github.com/ProsperCraft/041cd4302b39193ca7783357d0184ae5

After rebooting the server-
https://gist.github.com/ProsperCraft/0e981b44731d6f00277a3f2f9aeedea6

Here is a clean one without foamfix or blur-

https://gist.github.com/ProsperCraft/c21171d41769549796664208e85fe888

This stack trace was in console, this might help.

https://gist.github.com/ProsperCraft/e27c08a566abcff1993152176f81ca0d

your last 3 crashlogs are failing in exactly the same spot. Furthermore from what I can find it is actually crashing inside the rendering error handler so you either have a corrupt world or something is seriously messing with your rendering that is not Mekanism. Either the blockstate is null, or the block referenced by it is null.

I'm leaving this open only because there is a potential NPE in Mekanism as I mentioned before, however impossible it should be under normal circumstances.

I suggest you start removing mods one by one until the error stops, starting with the listed coremods.

Reply from a player in that base...

tried without foamfix, with optifine, all settings off and render fast, nothing.

A builders wand was not used to place them

They were using red.

this should be fixed for next release

Fixed in 3cc755f