java.lang.NullPointerException: Exception in server tick loop
at sonar.core.handlers.container.SonarItemHandler.canHandleItem(SonarItemHandler.java:18)
at sonar.flux.connection.FluxHelper.canTransferEnergy(FluxHelper.java:171)
at sonar.flux.connection.FluxHelper.pushEnergy(FluxHelper.java:116)
at sonar.flux.connection.BasicFluxNetwork.updateNetwork(BasicFluxNetwork.java:94)
at sonar.flux.FluxEvents.onServerTick(FluxEvents.java:35)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_882_FluxEvents_onServerTick_ServerTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185)
at net.minecraftforge.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:274)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:602)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:149)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
at java.lang.Thread.run(Unknown Source)

After installing a Flux Plug in a enderio item/energy conduit bundle.

UPDATE: Managing ANY network part (Plug, Point and even the Controller) crashes with the same log.
Even after turning the item feature off in the config.

Looks like I'll have to downgrade to the last working version.

Ah, and I also have the latest SonarCore version for 1.10.2.

One of my players is also experiencing this issue too on latest versions.

It seems to be localised to just his account. I have gone to his area on my account and the server has been fine. I have also swapped player data with him, and been able to log in.

it leaves us to suspect that a mod is using his UUID somehow causing the crash.

below is a copy of the server read-out from when he joins to when the server starts to stop.
crash.txt

Fixed in dev