diff --git a/app.js b/app.js
index 952c73c..e394a99 100755
--- a/app.js
+++ b/app.js
@@ -376,6 +376,7 @@ class AtomicCalendar extends LitElement {
 	}
 
 	setConfig(config) {
+		config = JSON.parse(JSON.stringify(config));
 		if (!config.entities) {
 			throw new Error('You need to define entities');
 		}