diff --git a/README.md b/README.md
index 919d8796f61e..03b45e44d159 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ under the License.
 Superset
 =========
 
+
 [![Build Status](https://travis-ci.org/apache/incubator-superset.svg?branch=master)](https://travis-ci.org/apache/incubator-superset)
 [![PyPI version](https://badge.fury.io/py/apache-superset.svg)](https://badge.fury.io/py/apache-superset)
 [![Coverage Status](https://codecov.io/github/apache/incubator-superset/coverage.svg?branch=master)](https://codecov.io/github/apache/incubator-superset)
diff --git a/superset/viz.py b/superset/viz.py
index 3de5e0501d6b..d6d8ca6f0599 100644
--- a/superset/viz.py
+++ b/superset/viz.py
@@ -475,6 +475,7 @@ def get_df_payload(self, query_obj=None, **kwargs):
                     logger.warning("Could not cache key {}".format(cache_key))
                     logger.exception(ex)
                     cache.delete(cache_key)
+
         return {
             "cache_key": self._any_cache_key,
             "cached_dttm": self._any_cached_dttm,
@@ -484,8 +485,8 @@ def get_df_payload(self, query_obj=None, **kwargs):
             "form_data": self.form_data,
             "is_cached": self._any_cache_key is not None,
             "query": self.query,
-            "from_dttm": self.from_dttm,
-            "to_dttm": self.to_dttm,
+            "from_dttm": self.from_dttm if hasattr(self, "from_dttm") else None,
+            "to_dttm": self.to_dttm if hasattr(self, "to_dttm") else None,
             "status": self.status,
             "stacktrace": stacktrace,
             "rowcount": len(df.index) if df is not None else 0,