diff --git a/superset/migrations/versions/2023-05-11_12-41_4ea966691069_cross_filter_global_scoping.py b/superset/migrations/versions/2023-05-11_12-41_4ea966691069_cross_filter_global_scoping.py
index 638e54430fb3a..eac4f0a2b6a75 100644
--- a/superset/migrations/versions/2023-05-11_12-41_4ea966691069_cross_filter_global_scoping.py
+++ b/superset/migrations/versions/2023-05-11_12-41_4ea966691069_cross_filter_global_scoping.py
@@ -59,7 +59,7 @@ def upgrade():
         #
         needs_upgrade = True
         try:
-            json_metadata = json.loads(dashboard.json_metadata)
+            json_metadata = json.loads(dashboard.json_metadata or "{}")
             new_chart_configuration = {}
             for config in json_metadata.get("chart_configuration", {}).values():
                 chart_id = int(config.get("id", 0))