stevensuting opened a new issue #16436:
URL: https://github.com/apache/superset/issues/16436


   In version 1.3 when adding a chart to a dashboard via dashboard edit mode, 
it throws an error in an arbitrary fashion. So cannot share exact steps to 
recreate the issue.
   <img width="400" alt="Add chart to dashbaord" 
src="https://user-images.githubusercontent.com/8875448/130743298-6acbd473-ca28-4e73-9695-0be262d4882e.png";>
   
   
   ### Stacktrace
   `Traceback (most recent call last):`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/views/base.py", 
line 204, in wraps
       return f(self, *args, **kwargs)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/utils/log.py", 
line 241, in wrapper
       value = f(*args, **kwargs)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/utils/cache.py", 
line 167, in wrapper
       return f(*args, **kwargs)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/views/utils.py", 
line 472, in wrapper
       return f(*args, **kwargs)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/views/core.py", 
line 664, in explore_json
       return self.generate_json(viz_obj, response_type)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/views/core.py", 
line 462, in generate_json
       payload = viz_obj.get_payload()`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/viz.py", line 
455, in get_payload
       payload["data"] = self.get_data(df)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/superset/viz.py", line 
936, in get_data
       df = df.stack(0).unstack().reindex(level=-1, columns=metrics)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/pandas/util/_decorators.py",
 line 312, in wrapper
       return func(*args, **kwargs)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/pandas/core/frame.py", 
line 4176, in reindex
       return super().reindex(**kwargs)`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/pandas/core/generic.py", 
line 4811, in reindex
       return self._reindex_axes(`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/pandas/core/frame.py", 
line 4016, in _reindex_axes
       frame = frame._reindex_columns(`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/pandas/core/frame.py", 
line 4058, in _reindex_columns
       new_columns, indexer = self.columns.reindex(`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/pandas/core/indexes/base.py",
 line 3509, in reindex
       _, indexer, _ = self._join_level(`
   `File 
"/home/ubuntu/superset1.1/lib/python3.9/site-packages/pandas/core/indexes/base.py",
 line 3880, in _join_level
       assert isinstance(left, MultiIndex)`
   `AssertionError`
   `2021-08-24 07:31:36,933:ERROR:superset.views.base:`
   
   
   ### Environment
   - superset version: `1.3`
   - python version: `3.9`
   - pip install method
   
   cc: @villebro 


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