#vulnerable code 
                                @Override
    public Environment setUpEnvironment(@SuppressWarnings("rawtypes") AbstractBuild build, Launcher launcher, BuildListener listener) throws IOException, InterruptedException, Run.RunnerAbortedException {
        GhprbTrigger trigger = Ghprb.extractTrigger(build);
        if (trigger != null) {
            trigger.getBuilds().onEnvironmentSetup(build, launcher, listener);
        }

        return new hudson.model.Environment(){};
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public Environment setUpEnvironment(@SuppressWarnings("rawtypes") AbstractBuild build, Launcher launcher, BuildListener listener) throws IOException, InterruptedException, Run.RunnerAbortedException {
        GhprbTrigger trigger = Ghprb.extractTrigger(build);
        if (trigger != null && trigger.getBuilds() != null) {
            trigger.getBuilds().onEnvironmentSetup(build, launcher, listener);
        }

        return new hudson.model.Environment(){};
    }