Workaround:

In the custom_functions_inc.php file (create it if not exists) add the following function:

function custom_function_default_print_column_value( $p_column, $p_issue_row, $p_columns_target = COLUMNS_TARGET_VIEW_PAGE ) {

if ( COLUMNS_TARGET_CSV_PAGE == $p_columns_target ) {

$t_column_start = '';

$t_column_end = '';

$t_column_empty = '';

} else {

$t_column_start = '<td>';

$t_column_end = '</td>';

$t_column_empty = ' ';

}

    if ( strpos( $p_column, 'custom_' ) === 0 ) {
        echo $t_column_start;
        $t_custom_field = substr( $p_column, 7 );

        $t_field_id = custom_field_get_id_from_name( $t_custom_field );
        if ( $t_field_id === false ) {
            echo '@', $t_custom_field, '@';
        } else {
            $t_issue_id = $p_issue_row['id'];
            $t_project_id = $p_issue_row['project_id'];

            if ( custom_field_is_linked( $t_field_id, $t_project_id ) ) {
                $t_def = custom_field_get_definition( $t_field_id );
                print_custom_field_value( $t_def, $t_field_id, $t_issue_id );
            } else {
                // field is not linked to project
                echo $t_column_empty;
            }
        }
        echo $t_column_end;
    } else {
        if ( $p_columns_target != COLUMNS_TARGET_CSV_PAGE ) {
            $t_function = 'print_column_' . $p_column;
        } else {
            $t_function = 'csv_format_' . $p_column;
        }

        if ( function_exists( $t_function ) ) {
            if ( $p_columns_target != COLUMNS_TARGET_CSV_PAGE ) {
                $t_function( $p_issue_row, $p_columns_target );
            } else {
                $t_function( $p_issue_row[$p_column] );
            }
        } else {
            if ( isset( $p_issue_row[$p_column] ) ) {
                if ( $p_column == 'eta' ) {
                    echo '<td class="center">', get_enum_element( 'eta', $p_row['eta'] ), '</td>';
                } else {
                    echo $t_column_start . $p_issue_row[$p_column] . $t_column_end;
                }
            } else {
                echo $t_column_start . '@' . $p_column . '@' . $t_column_end;
            }
        }
    }
}