if !treeItem->has_key('children')
# First time retrieving the children for the item at index "idx"
- var lspserver = buf.BufLspServerGet(w:LspBufnr)
+ var lspserver = buf.BufLspServerGet(w:LspBufnr, 'callHierarchy')
if lspserver->empty() || !lspserver.running
return
endif