You can check if anything is selected first:
VB Code:
  1. If lstChar.SelectedItems.Length>0

  2. Dim lv As ListViewItem = lstChar.SelectedItems(0)

  3. End if

  4.  
  5. 'or

  6. If Not lstChar.SelectedItems.Length Is Nothing

  7. Dim lv As ListViewItem = lstChar.SelectedItems(0)

  8. End if