Expression Error: we cannot convert value null to type list

Hi mbasha_123 ,

It's there is a "null" value in the column, the "null" value is not list type, it can't execute the step you applied.

For example this column

When I select expand button>Extract Values

The null row get an error the same with yours.

Here's my solution, add the function try otherwise in the code.

Here's the original code which return an error.

= Table.TransformColumns(New, {"Name", each Text.Combine(List.Transform(_, Text.From)), type text})

Add try otherwise like this:

= Table.TransformColumns(New, {"Name", each try Text.Combine(List.Transform(_, Text.From)) otherwise null , type text})

Get the result.

I attach my sample below for your reference.

 

Best Regards,
Community Support Team _ kalyj

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.