TableRowSkinBase.recreateCells() method makes below two calls to dispose the skin.
cell.getSkin().dispose() and cell.setSkin(null)

Only one of these two calls is sufficient to dispose the skin.
Before JDK-8244112 was fixed, above two calls caused an NPE.
JDK-8244112 safe guards the dispose() method. But as a cleanup one of the two calls (preferably cell.getSkin().dispose()) should be removed.

We should also find other similar instances and fix them together.