diff --git a/lib/extension.js b/lib/extension.js
index 8618111..102c285 100644
--- a/lib/extension.js
+++ b/lib/extension.js
@@ -155,12 +155,12 @@
 			return;
 		}
 		if (group){
-			const remainingProperties = changedProperties.filter(function({group}){
-				return group !== group;
+			const remainingProperties = changedProperties.filter(function(changedProperty){
+				return changedProperty.group !== group;
 			});
 			changedPropertiesByWindow.set(window, remainingProperties);
-			changedProperties = changedProperties.filter(function({group}){
-				return group === group;
+			changedProperties = changedProperties.filter(function(changedProperty){
+				return changedProperty.group === group;
 			});
 		}
 		else {