v1.0.1: various safety checks and tweaks to prevent rare crashes

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/effects/SpellSprite.java

@@ -136,9 +136,9 @@ public class SpellSprite extends Image {
 		}
 		
 		SpellSprite sprite = GameScene.spellSprite();
-		sprite.revive();
-		sprite.reset( index );
 		sprite.target = ch;
-		all.put( ch,  sprite );
+		sprite.reset( index );
+		sprite.revive();
+		all.put( ch, sprite );
 	}
 }

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/PrisonBossLevel.java

@@ -578,6 +578,12 @@ public class PrisonBossLevel extends Level {
 		int tries = 0;
 		do {
 			tries++;
+
+			if (tries >= 100){
+				tries = 0;
+				fill -= 0.01f;
+			}
+
 			trapsPatch = Patch.generate(7, 7, fill, 0, false);
 
 			PathFinder.buildDistanceMap(tenguPos, BArray.not(trapsPatch, null));

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/plants/Sungrass.java

@@ -115,8 +115,10 @@ public class Sungrass extends Plant {
 		}
 
 		public void boost( int amount ){
-			level += amount;
-			pos = target.pos;
+			if (target != null) {
+				level += amount;
+				pos = target.pos;
+			}
 		}
 		
 		@Override

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/ui/QuickSlotButton.java

@@ -236,8 +236,10 @@ public class QuickSlotButton extends Button {
 			targeting = true;
 			CharSprite sprite = lastTarget.sprite;
 
-			sprite.parent.addToFront( crossM );
-			crossM.point(sprite.center(crossM));
+			if (sprite.parent != null) {
+				sprite.parent.addToFront(crossM);
+				crossM.point(sprite.center(crossM));
+			}
 
 			crossB.point(slot.sprite.center(crossB));
 			crossB.visible = true;