nbonnotte commented on issue #4042: Table View: unsupported operand type(s) for +: 'NoneType' and 'str' URL: https://github.com/apache/incubator-superset/issues/4042#issuecomment-352477248 The reason comes from the PR #3668, right here https://github.com/apache/incubator-superset/blame/af7cdeba4d7eb38c51467a5987b2b3321cf23c69/superset/utils.py#L734-L735 This assumes `f['col']` is not `None`. The previous version, https://github.com/apache/incubator-superset/blame/83e6807fa01c15d545244493920fb63a74a941f0/superset/utils.py#L687-L692, made no such assumption. I'll propose a fix
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