fixed NullPointerException

Author: fofola1

src/main/java/me/fofola1/CustomRecipes/CustomRecipes.java

@@ -89,6 +89,7 @@ public void onDisable() {
 
         for (UUID uuid : MenuData.getUUIDList()) {
             Player p = Bukkit.getPlayer(uuid);
+            if (p == null) continue;
             if (!p.isOnline()) continue;
             if (
                     p.getOpenInventory().getTopInventory().getHolder() instanceof CraftingRecipeMenuHolder ||