JSON: Expand nested columns with also NULL entries leads always to error

Hi primlchen ,

Check if the following similar solutions are helpful to you.

Solved: Re: Expression.Error: We cannot convert the value ... - Microsoft Power BI Community

Re: "cannot convert the value null to type list" a... - Power Platform Community (microsoft.com)

If the problem is still not resolved, please provide detailed error information and let me know immediately. Looking forward to your reply.

Best Regards,
Henry

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