diff --git a/data/time_series.go b/data/time_series.go
index 440fe14d8..0a4735b22 100644
--- a/data/time_series.go
+++ b/data/time_series.go
@@ -420,7 +420,7 @@ func WideToLong(wideFrame *Frame) (*Frame, error) {
 	if err != nil {
 		return nil, err
 	} else if wideLen == 0 {
-		return nil, fmt.Errorf("can not convert to long series, input fields have no rows")
+		return nil, ErrInputFieldsWithoutRows
 	}
 
 	var uniqueValueNames []string                        // unique names of Fields that are value types
diff --git a/data/time_series_errors.go b/data/time_series_errors.go
index cdb327c9b..4859d75c3 100644
--- a/data/time_series_errors.go
+++ b/data/time_series_errors.go
@@ -5,6 +5,7 @@ import "errors"
 var (
 	ErrorNullTimeValues = errors.New("unable to process the data to wide series because input has null time values, make sure all time values are not null")
 	ErrorSeriesUnsorted = errors.New("unable to process the data because it is not sorted in ascending order by time, please updated your query to sort the data by time and try again")
+	ErrInputFieldsWithoutRows = errors.New("can not convert to long series, input fields have no rows")
 )
 
 	
\ No newline at end of file