I was playing in the end and when I opened the map in the end, the game crashed and gave me this.

java.lang.NullPointerException: Rendering screen
at hunternif.mc.atlas.registry.MarkerType.calculateMip(MarkerType.java:139)
at hunternif.mc.atlas.client.gui.GuiAtlas.renderMarker(GuiAtlas.java:888)
at hunternif.mc.atlas.client.gui.GuiAtlas.func_73863_a(GuiAtlas.java:739)
at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:396)
at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1124)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
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:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)