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[1.12.2] Checking if player inventory is empty is inconsistent


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I'm creating a block that,when activated, will hurt the player if his inventory is empty, and if it isn't put a random item in the inventory into an itemstack list. It only sometimes does the intended behaviour, though, and I can't really tell when it does so.


Block.onBlockActivated code:


            List<ItemStack> lostItems = playerIn.getCapability(Capabilities.LOST_ITEMS_CAPABILITY, null).getLostItems();

                Random random = new Random();

                    playerIn.attackEntityFrom(new HoleDamageSource(), 19.0f);
                    int itemIndex = random.nextInt(playerIn.inventory.getSizeInventory());

                        itemIndex = random.nextInt(playerIn.inventory.getSizeInventory());

                playerIn.sendMessage(new TextComponentString("You reach in but find nothing inside"));
            return true;


EDIT: To clarify, sometimes it adds AIR items to the list when the inventory is empty (even though it shouldn't), but other times it hurts the player.

Edited by That_Martin_Guy
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