diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index ab02402..23deec6 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -2335,3 +2335,25 @@
   call delete('Xtest')
   call delete('Xtest2')
 endfunc
+
+func Test_FileType_spell()
+  if !isdirectory('/tmp')
+    throw "Skipped: requires /tmp directory"
+  endif
+
+  " this was crashing with an invalid free()
+  setglobal spellfile=/tmp/en.utf-8.add
+  augroup crash
+    autocmd!
+    autocmd BufNewFile,BufReadPost crashfile setf somefiletype
+    autocmd BufNewFile,BufReadPost crashfile set ft=anotherfiletype
+    autocmd FileType anotherfiletype setlocal spell
+  augroup END
+  func! NoCrash() abort
+    edit /tmp/crashfile
+  endfunc
+  call NoCrash()
+
+  au! crash
+  setglobal spellfile=
+endfunc