v2.1.1: fixed errors with ratmogrify expiring during ascension

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/buffs/AscensionChallenge.java

@@ -137,6 +137,7 @@ public class AscensionChallenge extends Buff {
 
 		if (enemy instanceof Ratmogrify.TransmogRat){
 			enemy = ((Ratmogrify.TransmogRat) enemy).getOriginal();
+			if (enemy == null) return;
 		}
 
 		//only enemies that are boosted count

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/hero/abilities/Ratmogrify.java

@@ -213,9 +213,10 @@ public class Ratmogrify extends ArmorAbility {
 		}
 
 		public Mob getOriginal(){
-			original.HP = HP;
-			original.pos = pos;
-			original.clearTime();
+			if (original != null) {
+				original.HP = HP;
+				original.pos = pos;
+			}
 			return original;
 		}
 
@@ -224,9 +225,8 @@ public class Ratmogrify extends ArmorAbility {
 		@Override
 		protected boolean act() {
 			if (timeLeft <= 0){
-				original.HP = HP;
-				original.pos = pos;
-				original.clearTime();
+				Mob original = getOriginal();
+				this.original = null;
 				GameScene.add(original);
 
 				EXP = 0;