How to reproduce

• open cms
• open site map
• Browse the tree
• select a node
• click on "delete"
• click ok to confirm the deletion
• click a second time on "delete" (button is available without node selected)
• click ok

Actual behavior

• an error occured

Expected behavior

• After a node is deleted, another node should be selected
• or the buttons should not be available because nothing is selected after the first deletion.

Refer
To 1084