diff --git a/combo/data/models.py b/combo/data/models.py
index e47e778b..daf7ee2a 100644
--- a/combo/data/models.py
+++ b/combo/data/models.py
@@ -1610,7 +1610,7 @@ class JsonCellBase(CellBase):
         json_content = self._json_content
         if json_content is None:
             return 'combo/json-error-cell.html'
-        if json_content.get('data'):
+        if isinstance(json_content, dict) and json_content.get('data'):
             if isinstance(json_content['data'], list):
                 first_element = json_content['data'][0]
                 if isinstance(first_element, dict):