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Helper I
Helper I

Power Query - Replacing empty cells in source with null in M query

I have a table in which say for example in  a table column title  has empty values for few rows .I am expanding my table in Power query and fetching only the title column.For few rows it is showing as error .I tried replacing errors with null however it worked but it is taking longer time . Is there anyway where I can check in if the table has empty rows then replace that with null else the values in title column for each row.

M query: 
Source = SharePoint.Tables("sharepoint site url",
#" " = Source{[Id=" "]}[Items],
#"Renamed Columns" = Table.RenameColumns(#" ",{{"ID", "ID.1"}}),
#"Removed Other Columns" = Table.SelectColumns(#"Renamed Columns",{"Id", "Title", "Modified", "Created"),
#"Expanded Author" = Table.ExpandRecordColumn(#"Removed Other Columns", "Author", {"Title"}, {"Author.Title"}),
#"Renamed Columns1" = Table.RenameColumns(#"Expanded Author",{{"Author.Title", "Author"}}),
#"Expanded Handler" = Table.ExpandRecordColumn(#"Renamed Columns1", "Handler", {"Title"}, {"Handler.Title"}),
#"Renamed Columns2" = Table.RenameColumns(#"Expanded Handler",{{"Handler.Title", "Handler"}}),
#"Expanded Assigned" = Table.ExpandRecordColumn(#"Renamed Columns2", "Assigned", {"Title"}, {"Assigned.Title"})
#"Expanded Assigned"

In the aboce m query the error is in the step #"Expanded Assigned" . I need the solution to belike if column title is blank then it should be null else it should give the value .So  during expanding the column I need to check on this condition.
Any suggestions please? 




Above is the error message and the error.



various options:


- add a step to replace errors

- use try ... otherwise ...     

- investigate the cell contents with Value.Is  before attempting to expand it.

View solution in original post

Community Support
Community Support

HI @NithyaKB,

You can refer to the following links to know how to process these errors.

Odata wiht URL Conventions:

OData URL Conventions

Power query error handling:

Error handling - Power Query | Microsoft Docs

Dealing with errors - Power Query | Microsoft Docs


Xiaoxin Sheng

Community Support Team _ Xiaoxin
If this post helps, please consider accept as solution to help other members find it more quickly.
Helper I
Helper I

Yeah but we are in a need to import data through sharepoint online. Can you please suggest the changes to be added in m query.

various options:


- add a step to replace errors

- use try ... otherwise ...     

- investigate the cell contents with Value.Is  before attempting to expand it.

Can you please help me out with the exact m query

Super User
Super User

Remember that you can run ODATA queries that can pre-filter those rows.

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