The game and the server crashed while moving a Thermal Evaporation Block with a piston.

Error:

Description: Ticking block entity

java.lang.NullPointerException: Ticking block entity
at mekanism.common.tile.prefab.TileEntityBasicBlock.func_145829_t(TileEntityBasicBlock.java:149)
at vazkii.quark.automation.feature.PistonsMoveTEs.getAndClearMovement(PistonsMoveTEs.java:201)
at vazkii.quark.automation.feature.PistonsMoveTEs.setPistonBlock(PistonsMoveTEs.java:121)
at vazkii.quark.base.asm.ASMHooks.setPistonBlock(ASMHooks.java:151)
at net.minecraft.tileentity.TileEntityPiston.func_73660_a(TileEntityPiston.java:337)
at net.minecraft.world.World.func_72939_s(World.java:1838)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1847)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

My guess is that this is a bug with quark making TileEntities pushable, given if memory serves they are not natively pushable in 1.12. If this still occurs in 1.15, then feel free to open another issue and I can look into it more at that time, given I believe that Mojang did introduce a way for know if a Tile is being moved.

What version of Mekanism is this?

That reply came quick!

Those are the versions we use:

Mekanism-1.12.2-9.8.3.390
MekanismGenerators-1.12.2-9.8.3.390
MekanismTools-1.12.2-9.8.3.390

Approved. Error came with Quark.