v0.8.0: fixed rare crash errors with spinners and blast wave effects

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

@@ -158,7 +158,12 @@ public class Spinner extends Mob {
 				break;
 			}
 		}
-		
+
+		//in case target is at the edge of the map and there are no more cells in the path
+		if (b.path.size() <= collisionIndex){
+			return -1;
+		}
+
 		int webPos = b.path.get( collisionIndex+1 );
 		
 		if (Dungeon.level.passable[webPos]){

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/wands/WandOfBlastWave.java

@@ -135,6 +135,8 @@ public class WandOfBlastWave extends DamageWand {
 			collided = true;
 		}
 
+		if (dist < 0) return;
+
 		final int newPos = trajectory.path.get(dist);
 
 		if (newPos == ch.pos) return;