fixed bugs, memory leaks, etc

src/main/java/dev/zprestige/prestige/combat/ExplosionDamageCalculator.java

@@ -73,6 +73,10 @@ public class ExplosionDamageCalculator implements MinecraftAccess {
     }
 
     public double getCrystalDamage(LivingEntity target, Vec3d crystalPos, boolean predictMotion, BlockPos obsidianPos, boolean ignoreTerrain) {
+        if (mc.world == null || mc.player == null || mc.getNetworkHandler() == null) {
+            return 0.0;
+        }
+
         long worldTime = mc.world.getTime();
         if (worldTime != this.cacheTime) {
             this.damageCache.clear();
@@ -305,6 +309,10 @@ public class ExplosionDamageCalculator implements MinecraftAccess {
     }
 
     private double getExposureWithOffset(Vec3d source, Entity entity, Vec3d boxOffset, RaycastContext context, BlockPos obsidianPos, boolean ignoreTerrain, BlockPos airPos, BlockPos placedBlockPos, BlockState placedBlockState) {
+        if (context == null) {
+            context = this.raycastContext = new RaycastContext(null, null, ShapeType.COLLIDER, FluidHandling.ANY, mc.player);
+        }
+
         Box box = entity.getBoundingBox();
         if (boxOffset != null) {
             box = box.offset(boxOffset.x, boxOffset.y, boxOffset.z);