Index: pluginconf/gui.py
==================================================================
--- pluginconf/gui.py
+++ pluginconf/gui.py
@@ -126,11 +126,11 @@
             return [sg.Image(filename=re.sub("[^/]+$", img_fn, pmd.fn), **size)]
     return []
 
 def plugin_entry(pmd, plugin_states):
     """ checkbox for plugin name """
-    if not instanceof(pmd, pluginconf.PluginMeta):
+    if not isinstance(pmd, pluginconf.PluginMeta):
         pmd = pluginconf.PluginMeta(pmd)
     return [
         [
             sg.Checkbox(
                 pmd.get("title", pmd.id), key='p:'+pmd.id, default=plugin_states.get(pmd.id, 0),