Set<Block> chestBlocks = chestContents.keySet();
for (Block cb : chestBlocks) {
	BlockState st = cb.getState();
	if (st instanceof Chest) {
		Chest ch = (Chest) st;
		if (ch != null) {
			if (ch.getInventory() != null && chestContents.get(cb) != null) {
				ch.getInventory().setContents(chestContents.get(cb));
			}
		}
	}
}