diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index 77ba8a7dc48..d1f42575b62 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -241,7 +241,8 @@ class Project(models.Model):
         project = super(Project, self).copy(default)
         for follower in self.message_follower_ids:
             project.message_subscribe(partner_ids=follower.partner_id.ids, subtype_ids=follower.subtype_ids.ids)
-        self.map_tasks(project.id)
+        if 'tasks' not in default:
+            self.map_tasks(project.id)
         return project
 
     @api.model
diff --git a/addons/web/static/src/js/views/graph_widget.js b/addons/web/static/src/js/views/graph_widget.js
index 3b7abcea0af..08649a16d81 100644
--- a/addons/web/static/src/js/views/graph_widget.js
+++ b/addons/web/static/src/js/views/graph_widget.js
@@ -100,7 +100,7 @@ return Widget.extend({
             }));
         } else {
             var chart = this['display_' + this.mode]();
-            if (chart) {
+            if (chart && chart.tooltip.chartContainer) {
                 chart.tooltip.chartContainer(this.$el[0]);
             }
         }