Check that the json blob is a media object before deserializing it
@@ -311,7 +311,7 @@ class Table(Media):
row_data = []
for item in row:
cell = item
- if isinstance(item, dict):
+ if isinstance(item, dict) and "_type" in item:
obj = WBValue.init_from_json(item, source_artifact)
if obj is not None:
cell = obj
