Version: 1.12.2-20.0.2
Addon Packs - All of them
Crash Log -

java.lang.NullPointerException: Exception ticking world at minecrafttransportsimulator.blocks.tileentities.instances.TileEntitySignalController.update(TileEntitySignalController.java:76) at minecrafttransportsimulator.mcinterface.BuilderTileEntity$Tickable.func_73660_a(BuilderTileEntity.java:146) at com.github.terminatornl.tiquality.tracking.tickexecutors.ForgeTickExecutor.onTileEntityTick(ForgeTickExecutor.java:30) at net.minecraft.tileentity.TileEntity.tiquality_doUpdateTick(TileEntity.java:629) at com.github.terminatornl.tiquality.tracking.TrackerBase.updateOld(TrackerBase.java:190) at com.github.terminatornl.tiquality.tracking.TrackerBase.doRandomBlockTick(TrackerBase.java:314) at com.github.terminatornl.tiquality.tracking.TickHub.onRandomBlockTick(TickHub.java:43) at net.minecraft.world.WorldServer.redirect$zze000$onRandomBlockTick(WorldServer.java:1941) at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:476) at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:225) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756) at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) at java.lang.Thread.run(Thread.java:748)

Fixed in V20.0.3.