When you try and go into a compact machine while morphing it will crash the game. In the console it will give the error Null pointers. I then tried to replicate this to see if it would happen again and it did but this time it crashed the server giving no error.

Here is the client crash log. I also tried to see if I can make it crash the server again and I did but still gives no log. Please let me know too if you would like the hole log or if this is enough.

Unreported exception thrown!
java.lang.NullPointerException
at me.ichun.mods.morph.client.core.EventHandlerClient.onRenderTick(EventHandlerClient.java:798)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_1009_EventHandlerClient_onRenderTick_RenderTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
at net.minecraftforge.fml.common.FMLCommonHandler.onRenderTickStart(FMLCommonHandler.java:353)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1115)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:397)
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:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

To add on to the context of this issue, this bug is actually a result of changing dimensions while morphing at all. This crash has occured multiple times in a (slightly) modified direwolf20 1.12 FTB pack: Gist of crashlog

So it would be because I added a mod?

Should be fixed in 7.1.3.