#vulnerable code 
                                @Override
    public void visit( StyleColumnElement ele )
    {
        StyleSectionProperties sectionProperties = currentStyle.getSectionProperties();
        if ( sectionProperties == null )
        {
            // style:column outside style:section-properties, ignore it
            return;
        }

        StyleColumnsProperties columnsProperties = sectionProperties.getColumnsProperties();
        if ( columnsProperties == null )
        {
            // style:column outside style:columns, ignore it
        }

        StyleColumnProperties columnProperties = new StyleColumnProperties();

        // rel-width
        String relWidth = ele.getStyleRelWidthAttribute();
        if ( StringUtils.isNotEmpty( relWidth ) )
        {
            columnProperties.setRelWidth( ODFUtils.getRelativeSize( relWidth ) );
        }

        columnsProperties.getColumnProperties().add( columnProperties );

        super.visit( ele );
    } 
                            #location 26 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public void visit( StyleColumnElement ele )
    {
        List<StyleColumnProperties> styleColumnPropertiesList = currentStyle.getColumnPropertiesList();
        if ( styleColumnPropertiesList == null )
        {
            styleColumnPropertiesList = new ArrayList<StyleColumnProperties>();
            currentStyle.setColumnPropertiesList( styleColumnPropertiesList );
        }
        StyleColumnProperties columnProperties = new StyleColumnProperties();

        // rel-width
        String relWidth = ele.getStyleRelWidthAttribute();
        if ( StringUtils.isNotEmpty( relWidth ) )
        {
            columnProperties.setRelWidth( ODFUtils.getRelativeSize( relWidth ) );
        }

        styleColumnPropertiesList.add( columnProperties );

        super.visit( ele );
    }