diff --git a/src/components/ConcernementMapItem.vue b/src/components/ConcernementMapItem.vue
index 80ec86e..698a932 100644
--- a/src/components/ConcernementMapItem.vue
+++ b/src/components/ConcernementMapItem.vue
@@ -804,7 +804,7 @@ export default {
       // then scale again to new size
       this.paper_main_object.scale(this.details_zoom_scale);
       // resize entites (dim them while we zoomin)
-      if(this.paper_main_object.children){
+      if(this.paper_main_object.children && this.paper_main_object.children['entites']){
         this.paper_main_object.children['entites'].children.forEach((child) => {
           if(child.name === 'entite'){
             // revert to the original size (by reverting the previous scale)