diff --git a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
index d083b7e..26c2665 100644
--- a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
+++ b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
@@ -1220,7 +1220,7 @@
     win_gotoid(curwinid)
     winbar_winids = []
 
-    if exists('saved_mousemodel')
+    if saved_mousemodel != ''
       &mousemodel = saved_mousemodel
       saved_mousemodel = null_string
       try