Did Hezekiah sin?

I wonder if Hezekiah sinned in asking for his life to be extended. To that point he had been faithful to the Lord but it appears that he was less careful in those extra 15 years, showing off his wealth to the visiting Babylonians being the remarked failure. The thing that makes me really question it though it’s the son who succeeded him and did wickedly. His heir was only 12 when his reign began and he may never have known his father in the many years of careful faithfulness to the Lord.