Merge pull request #669 from hrsh7th/fix-user-data-clear

Fix #668

Author: hrsh7th

autoload/lsp/ui/vim/completion.vim

@@ -23,7 +23,9 @@ endfunction
 " 6. then the line is `call getbufline(|` in `s:on_complete_done_after`
 "
 function! s:on_complete_done() abort
-  if empty(v:completed_item)
+  " Somtimes, vim occurs `CompleteDone` unexpectedly.
+  " We try to detect it by checking empty completed_item.
+  if empty(v:completed_item) || get(v:completed_item, 'word', '') ==# '' && get(v:completed_item, 'abbr', '') ==# ''
     doautocmd User lsp_complete_done
     return
   endif