#vulnerable code 
                                public void delete() throws IOException {
        team.root.createRequest()
                .method("DELETE")
                .setRawUrlPath(team.getUrl().toString() + "/discussions/" + number)
                .send();
    } 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void delete() throws IOException {
        team.root.createRequest().method("DELETE").setRawUrlPath(getRawUrlPath(team, number)).send();
    }