```
2018-09-19 16:44:44,467:DEBUG:root:[36m[stats_logger] (incr)
loaded_from_source[0m
2018-09-19 16:44:44,467:ERROR:root:'NoneType' object is not iterable
Traceback (most recent call last):
File
"/home/serg/miniconda3/lib/python3.5/site-packages/superset/views/core.py",
line 1105, in generate_json
payload = viz_obj.get_payload()
File "/home/serg/miniconda3/lib/python3.5/site-packages/superset/viz.py",
line 359, in get_payload
payload['data'] = self.get_data(df)
File "/home/serg/miniconda3/lib/python3.5/site-packages/superset/viz.py",
line 1381, in get_data
df = self.process_data(df)
File "/home/serg/miniconda3/lib/python3.5/site-packages/superset/viz.py",
line 1147, in process_data
values=utils.get_metric_names(fd.get('metrics')))
File "/home/serg/miniconda3/lib/python3.5/site-packages/superset/utils.py",
line 840, in get_metric_names
return [get_metric_name(metric) for metric in metrics]
TypeError: 'NoneType' object is not iterable
```
error at line 44. Step to reproduce the error:
1 - from Sources >> Tables, select birth_names table
2 - after the query/explore page load, select TIme Series - Periodicity Pivot
as the Visualization Type
[ Full content available at:
https://github.com/apache/incubator-superset/pull/5928 ]
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