v2.1.0: fixed rare crashes caused by explosive curse

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/weapon/curses/Explosive.java

@@ -73,6 +73,9 @@ public class Explosive extends Weapon.Enchantment {
 					explosionPos = defender.pos+i;
 				}
 			}
+			if (explosionPos == -1) {
+				explosionPos = defender.pos;
+			}
 
 			new Bomb.MagicalBomb().explode(explosionPos);