#vulnerable code 
                                private void deleteStylesForWorkspace(String workspace) {
        RESTStyleList styles = styleManager.getStyles(workspace);
        for (NameLinkElem nameLinkElem : styles) {
            removeStyleInWorkspace(workspace, nameLinkElem.getName(), true);
        }
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private void deleteStylesForWorkspace(String workspace) {
        RESTStyleList styles = styleManager.getStyles(workspace);
        if (styles==null)
            return;
        for (NameLinkElem nameLinkElem : styles) {
            removeStyleInWorkspace(workspace, nameLinkElem.getName(), true);
        }
    }