v0.7.1a: added safety checks to blacksmith and bones

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Bones.java

@@ -139,6 +139,8 @@ public class Bones {
 			if (depth == Dungeon.depth && Dungeon.challenges == 0) {
 				FileUtils.deleteFile( BONES_FILE );
 				depth = 0;
+				
+				if (item == null) return null;
 
 				//Enforces artifact uniqueness
 				if (item instanceof Artifact){

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/npcs/Blacksmith.java

@@ -200,7 +200,9 @@ public class Blacksmith extends NPC {
 		}
 		first.level(first.level()+1); //prevents on-upgrade effects like enchant/glyph removal
 		if (first instanceof MissileWeapon && !Dungeon.hero.belongings.contains(first)) {
-			first.collect();
+			if (!first.collect()){
+				Dungeon.level.drop( first, Dungeon.hero.pos );
+			}
 		}
 		Dungeon.hero.spendAndNext( 2f );
 		Badges.validateItemLevelAquired( first );