From b50fd3eab066b6eca7b77c172ff0cdc840604023 Mon Sep 17 00:00:00 2001
From: Shuyao Bi <shuyaob@andrew.cmu.edu>
Date: Fri, 15 Jan 2021 14:09:06 -0800
Subject: [PATCH] Fix 500 error when loading dashboards with slice having
 deleted dataset (#12535)

---
 superset/models/dashboard.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/superset/models/dashboard.py b/superset/models/dashboard.py
index d3a8363dce..d7c2a6978a 100644
--- a/superset/models/dashboard.py
+++ b/superset/models/dashboard.py
@@ -237,6 +237,7 @@ class Dashboard(  # pylint: disable=too-many-instance-attributes
                 # Filter out unneeded fields from the datasource payload
                 datasource.uid: datasource.data_for_slices(slices)
                 for datasource, slices in datasource_slices.items()
+                if datasource
             },
         }