Crash report (Object reference not set to an instance of an object)

STEPS TO REPRODUCE:

In the attached game file, remove the stairs, turn off In World UI in the eye tab, and then attempt to build something.

NOTE: removing the stairs may not be a required step, it's just something I've done every time.

The exception popped up multiple times, all with the same object hash, each time it happened.

```

Noble Fates Critical Error:

NullReferenceException: Object reference not set to an instance of an object

UIPropPreviewWindowContents.SetTitle (System.String title) (at <49b27a2fdb57438296b7852e2fd09afe>:0)

PropManager.RefreshPreview () (at <49b27a2fdb57438296b7852e2fd09afe>:0)

CornerPropToolsSelectionMode.Update () (at <49b27a2fdb57438296b7852e2fd09afe>:0)

PropManager.HandleMouse () (at <49b27a2fdb57438296b7852e2fd09afe>:0)

SelectionManager.Tick (System.Single dt) (at <49b27a2fdb57438296b7852e2fd09afe>:0)

ManagerBehavior.Update () (at <49b27a2fdb57438296b7852e2fd09afe>:0)

```