diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 47b9b47..0aa82ef 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -4208,6 +4208,18 @@
   enew | only
 endfunc
 
+" Similar to the problem above, but for user data.
+func Test_ll_window_user_data()
+  call setloclist(0, [#{bufnr: bufnr(), user_data: {}}])
+  lopen
+  wincmd t
+  close
+  call test_garbagecollect_now()
+  call feedkeys("\<CR>", 'tx')
+  call test_garbagecollect_now()
+  %bwipe!
+endfunc
+
 " The following test used to crash vim
 func Test_lfile_crash()
   sp Xtest