diff --git a/calendar/js/et2_widget_event.js b/calendar/js/et2_widget_event.js
index e54c37e6fd..da8d747ca6 100644
--- a/calendar/js/et2_widget_event.js
+++ b/calendar/js/et2_widget_event.js
@@ -701,13 +701,16 @@ var et2_calendar_event = et2_valueWidget.extend([et2_IDetachedDOM],
 			old_daywise.splice(old_daywise.indexOf(this.options.value.id),1);
 			egw.dataStoreUID(old_cache_id,old_daywise);
 		}
-		if (new_daywise.indexOf(event.id) < 0)
+		if(new_cache_id != old_cache_id)
 		{
-			new_daywise.push(event.id);
-		}
-		if(new_daywise.data !== null)
-		{
-			egw.dataStoreUID(new_cache_id,new_daywise);
+			if (new_daywise.indexOf(event.id) < 0)
+			{
+				new_daywise.push(event.id);
+			}
+			if(new_daywise.data !== null)
+			{
+				egw.dataStoreUID(new_cache_id,new_daywise);
+			}
 		}
 
 		return false;