ISERROR DAX Function (Information) Not recommended

Checks whether a value is an error, and returns TRUE or FALSE.


ISERROR ( <Value> )
Parameter Attributes Description

The value you want to test.

Return values

Scalar A single boolean value.

A Boolean value of TRUE if the value is an error; otherwise FALSE.


IFERROR and ISERROR are not able to catch all runtime errors. Whether or not they can catch an error depends on the choice of execution plans. When the query plan chooses a faster execution (block mode), errors may not be captured. In light of their limitations, the two functions are discouraged.

Read Appropriate use of error functions for best practices about using IFERROR and ISERROR.

» 1 related function


--  ISERROR detects if its argument produces an error.
--  It is commonly replaced by IFERROR, that includes in the 
--  same function both IF and ISERROR.
MEASURE Sales[Year Value unprotected] = 
    VAR CurrentYear = SELECTEDVALUE ( 'Date'[Calendar Year] )
    RETURN VALUE ( CurrentYear )
MEASURE Sales[Year Value] = 
    VAR CurrentYear = SELECTEDVALUE ( 'Date'[Calendar Year] )
        IF (
            ISERROR ( INT ( VALUE ( CurrentYear ) ) ),
            INT ( VALUE ( RIGHT ( CurrentYear, 4 ) ) ),
            INT ( VALUE ( CurrentYear ) )
        'Date'[Calendar Year], 
        --"Year Value unprotected", [Year Value unprotected]
        "Year Value", [Year Value]
ORDER BY [Calendar Year]
Calendar Year Year Value
2005-01-01 2,005
2006-01-01 2,006
2007-01-01 2,007
2008-01-01 2,008
2009-01-01 2,009
2010-01-01 2,010
2011-01-01 2,011

Related functions

Other related functions are:

Last update: May 23, 2024   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo, Imke Feldmann

Microsoft documentation:

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Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.


Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.


This function is deprecated. Jump to the Alternatives section to see the function to use.


A volatile function may return a different result every time you call it, even if you provide the same arguments. Click to read more.


This parameter is deprecated and its use is not recommended.

DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.


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