diff --git a/deluge/ui/web/js/ext-extensions-debug.js b/deluge/ui/web/js/ext-extensions-debug.js
index 9308ca57e..c747bdd0b 100644
--- a/deluge/ui/web/js/ext-extensions-debug.js
+++ b/deluge/ui/web/js/ext-extensions-debug.js
@@ -775,6 +775,7 @@ Ext.override(Ext.form.RadioGroup, {
 	},
 
 	setValue: function(v) {
+		if (!this.items.each) return;
 		this.items.each(function(item) {
 			item.setValue((item.getRawValue() === 'true') == v);
 		});