From 337454b646c71bc313714b849dec49b4d7459a4d Mon Sep 17 00:00:00 2001
From: Maxime Beauchemin <maximebeauchemin@gmail.com>
Date: Wed, 5 Apr 2017 19:00:49 +0000
Subject: [PATCH] [hotfix] slice with missing datasource related

---
 superset/models/core.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/superset/models/core.py b/superset/models/core.py
index f61b33a12fccc..f825508ce8e95 100644
--- a/superset/models/core.py
+++ b/superset/models/core.py
@@ -50,7 +50,8 @@ def set_related_perm(mapper, connection, target):  # noqa
     src_class = target.cls_model
     id_ = target.datasource_id
     ds = db.session.query(src_class).filter_by(id=int(id_)).first()
-    target.perm = ds.perm
+    if ds:
+        target.perm = ds.perm
 
 
 class Url(Model, AuditMixinNullable):