diff --git a/src/calibre/customize/ui.py b/src/calibre/customize/ui.py
index 6f86101d14..2e1cc23c4e 100644
--- a/src/calibre/customize/ui.py
+++ b/src/calibre/customize/ui.py
@@ -677,7 +677,10 @@ def main(args=sys.argv):
                                 )
             print '\t', plugin.description
             if plugin.is_customizable():
-                print '\t', plugin.customization_help()
+                try:
+                    print '\t', plugin.customization_help()
+                except NotImplementedError:
+                    pass
             print
 
     return 0