diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java
index 01bd07a8f..5f67d9160 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java
@@ -266,6 +266,8 @@ public class PrisonBossLevel extends Level {
 		for (Mob mob : Dungeon.level.mobs.toArray(new Mob[Dungeon.level.mobs.size()])){
 			if (mob != tengu && (safeArea == null || !safeArea.inside(cellToPoint(mob.pos)))){
 				mob.destroy();
+				if (mob.sprite != null)
+					mob.sprite.killAndErase();
 			}
 		}
 		for (Plant plant : plants.values()){