nullpointer is confusing

src/main/java/baritone/process/BuilderProcess.java

@@ -275,7 +275,7 @@ public class BuilderProcess extends BaritoneProcessHelper implements IBuilderPro
                 double z = side.getZOffset() == 0 ? 0.5 : (1 + side.getZOffset()) / 2D;
                 return new Vec3d[]{new Vec3d(x, 0.25, z), new Vec3d(x, 0.75, z)};
             default: // null
-                throw new NullPointerException();
+                throw new IllegalStateException();
         }
     }