diff --git a/lib/solaar/ui/config_panel.py b/lib/solaar/ui/config_panel.py
index c07e257f..e8f99d56 100644
--- a/lib/solaar/ui/config_panel.py
+++ b/lib/solaar/ui/config_panel.py
@@ -479,6 +479,7 @@ class MultipleRangeControl(MultipleControl):
 
 class PackedRangeControl(MultipleRangeControl):
     def setup(self, setting):
+        self._items = []
         validator = setting._validator
         for item in range(validator.count):
             h = Gtk.HBox(homogeneous=False, spacing=0)