v2.0.1: added various safety checks for rare crashes

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/hero/Hero.java

@@ -1992,6 +1992,12 @@ public class Hero extends Char {
 	
 	@Override
 	public void onAttackComplete() {
+
+		if (enemy == null){
+			curAction = null;
+			super.onAttackComplete();
+			return;
+		}
 		
 		AttackIndicator.target(enemy);
 		boolean wasEnemy = enemy.alignment == Alignment.ENEMY

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/Mob.java

@@ -698,7 +698,7 @@ public abstract class Mob extends Char {
 
 	public boolean surprisedBy( Char enemy, boolean attacking ){
 		return enemy == Dungeon.hero
-				&& (enemy.invisible > 0 || !enemySeen || (fieldOfView != null && !fieldOfView[enemy.pos]))
+				&& (enemy.invisible > 0 || !enemySeen || (fieldOfView != null && fieldOfView.length == Dungeon.level.length() && !fieldOfView[enemy.pos]))
 				&& (!attacking || enemy.canSurpriseAttack());
 	}
 

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/Item.java

@@ -172,7 +172,10 @@ public class Item implements Bundlable {
 	}
 	
 	public void execute( Hero hero ) {
-		execute( hero, defaultAction() );
+		String action = defaultAction();
+		if (action != null) {
+			execute(hero, defaultAction());
+		}
 	}
 	
 	protected void onThrow( int cell ) {