v0.9.1b: added various safety checks to prevent crashes

SPD-classes/src/main/java/com/watabou/utils/Random.java

@@ -39,20 +39,20 @@ public class Random {
 		resetGenerators();
 	}
 
-	public static void resetGenerators(){
+	public static synchronized void resetGenerators(){
 		generators = new ArrayDeque<>();
 		generators.push(new java.util.Random());
 	}
 
-	public static void pushGenerator(){
+	public static synchronized void pushGenerator(){
 		generators.push( new java.util.Random() );
 	}
 
-	public static void pushGenerator( long seed ){
+	public static synchronized void pushGenerator( long seed ){
 		generators.push( new java.util.Random( seed ) );
 	}
 
-	public static void popGenerator(){
+	public static synchronized void popGenerator(){
 		if (generators.size() == 1){
 			Game.reportException( new RuntimeException("tried to pop the last random number generator!"));
 		} else {
@@ -61,7 +61,7 @@ public class Random {
 	}
 
 	//returns a uniformly distributed float in the range [0, 1)
-	public static float Float() {
+	public static synchronized float Float() {
 		return generators.peek().nextFloat();
 	}
 
@@ -81,7 +81,7 @@ public class Random {
 	}
 
 	//returns a uniformly distributed int in the range [0, max)
-	public static int Int( int max ) {
+	public static synchronized int Int( int max ) {
 		return max > 0 ? generators.peek().nextInt(max) : 0;
 	}
 
@@ -101,7 +101,7 @@ public class Random {
 	}
 
 	//returns a uniformly distributed long in the range [-2^63, 2^63)
-	public static long Long() {
+	public static synchronized long Long() {
 		return generators.peek().nextLong();
 	}
 
@@ -190,7 +190,7 @@ public class Random {
 			null;
 	}
 
-	public static<T> void shuffle( List<?extends T> list){
+	public synchronized static<T> void shuffle( List<?extends T> list){
 		Collections.shuffle(list, generators.peek());
 	}
 	

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

@@ -570,7 +570,8 @@ public class Item implements Bundlable {
 						@Override
 						public void call() {
 							curUser = user;
-							Item.this.detach(user.belongings.backpack).onThrow(cell);
+							Item i = Item.this.detach(user.belongings.backpack);
+							if (i != null) i.onThrow(cell);
 							if (curUser.hasTalent(Talent.IMPROVISED_PROJECTILES)
 									&& !(Item.this instanceof MissileWeapon)
 									&& curUser.buff(Talent.ImprovisedProjectileCooldown.class) == null){

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/sprites/GhoulSprite.java

@@ -22,6 +22,7 @@
 package com.shatteredpixel.shatteredpixeldungeon.sprites;
 
 import com.shatteredpixel.shatteredpixeldungeon.Assets;
+import com.watabou.noosa.Game;
 import com.watabou.noosa.TextureFilm;
 
 public class GhoulSprite extends MobSprite {
@@ -44,10 +45,10 @@ public class GhoulSprite extends MobSprite {
 		attack = new Animation( 12, false );
 		attack.frames( frames, 0, 8, 9 );
 
-		crumple = new Animation( 15, false);
+		crumple = new Animation( 1, false);
 		crumple.frames( frames, 0, 10, 11, 12 );
 
-		die = new Animation( 15, false );
+		die = new Animation( 1, false );
 		die.frames( frames, 0, 10, 11, 12, 13 );
 		
 		play( idle );
@@ -58,6 +59,16 @@ public class GhoulSprite extends MobSprite {
 		play(crumple);
 	}
 
+	@Override
+	public void move(int from, int to) {
+		if (parent == null){
+			//fixme this happens rarely, likely due to ghoul like link?
+			Game.reportException(new RuntimeException("ghoul sprite tried to move with null parent! ghoul HP: " + ch.HP));
+			return;
+		}
+		super.move(from, to);
+	}
+
 	@Override
 	public void die() {
 		if (curAnim == crumple){