bjtthao opened a new issue #7734: Export csv AttributeError: 'NoneType' object has no attribute 'index' URL: https://github.com/apache/incubator-superset/issues/7734 A clear and concise description of what the bug is. ### Expected results Successfully export CSV data ### Actual results AttributeError: 'NoneType' object has no attribute 'index' After re-login, it can be exported normally. #### Screenshots  #### How to reproduce the bug Click on dashboard Click on Export csv ### Environment - superset version: 0.24 - python version: 3.5.5 - node.js version: 0.10.48 - npm version: 1.3.6
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