diff --git a/plugin/ale.vim b/plugin/ale.vim
index bea5a49e..d9f1216e 100644
--- a/plugin/ale.vim
+++ b/plugin/ale.vim
@@ -228,7 +228,7 @@ call ale#autocmd#InitAuGroups()
 augroup ALECleanupGroup
     autocmd!
     " Clean up buffers automatically when they are unloaded.
-    autocmd BufDelete * call ale#engine#Cleanup(str2nr(expand('<abuf>')))
+    autocmd BufDelete * if exists('*ale#engine#Cleanup') | call ale#engine#Cleanup(str2nr(expand('<abuf>'))) | endif
     autocmd QuitPre * call ale#events#QuitEvent(str2nr(expand('<abuf>')))
 augroup END
 
diff --git a/test/test_autocmd_commands.vader b/test/test_autocmd_commands.vader
index b02f852c..63e704bd 100644
--- a/test/test_autocmd_commands.vader
+++ b/test/test_autocmd_commands.vader
@@ -191,7 +191,7 @@ Execute (g:ale_echo_cursor = 1 should bind cursor events):
 
 Execute (ALECleanupGroup should include the right commands):
   AssertEqual [
-  \ 'BufDelete * call ale#engine#Cleanup(str2nr(expand(''<abuf>'')))',
+  \ 'BufDelete * if exists(''*ale#engine#Cleanup'') | call ale#engine#Cleanup(str2nr(expand(''<abuf>''))) | endif',
   \ 'QuitPre * call ale#events#QuitEvent(str2nr(expand(''<abuf>'')))',
   \], CheckAutocmd('ALECleanupGroup')