#vulnerable code 
                             public static byte[] render(ReqImpl req, Resp resp) {

		Object result = resp.result();

		if (result != null) {
			result = wrapGuiContent(result);
			resp.model().put("result", result);
			resp.result(result);
		}

		ViewRenderer viewRenderer = req.routes().custom().viewRenderer();
		U.must(viewRenderer != null, "A view renderer wasn't configured!");

		PageRenderer pageRenderer = req.routes().custom().pageRenderer();
		U.must(pageRenderer != null, "A page renderer wasn't configured!");

		boolean rendered;
		String viewName = resp.view();
		ByteArrayOutputStream out = new ByteArrayOutputStream();

		MVCModel basicModel = new MVCModel(req, resp, resp.model(), resp.screen(), result);

		Object[] renderModel = result != null
			? new Object[]{basicModel, resp.model(), result}
			: new Object[]{basicModel, resp.model()};

		try {
			rendered = viewRenderer.render(req, viewName, renderModel, out);
		} catch (Throwable e) {
			throw U.rte("Error while rendering view: " + viewName, e);
		}

		String renderResult = rendered ? new String(out.toByteArray()) : null;

		if (renderResult == null) {
			Object cnt = U.or(result, "");
			renderResult = new String(HttpUtils.responseToBytes(req, cnt, MediaType.HTML_UTF_8, null));
		}

		try {
			Object response = U.or(pageRenderer.renderPage(req, resp, renderResult), "");
			return HttpUtils.responseToBytes(req, response, MediaType.HTML_UTF_8, null);

		} catch (Exception e) {
			throw U.rte("Error while rendering page!", e);
		}
	} 
                            #location 37 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             public static byte[] render(ReqImpl req, Resp resp) {

		Object result = resp.result();

		if (result != null) {
			result = wrapGuiContent(result);
			resp.model().put("result", result);
			resp.result(result);
		}

		ViewRenderer viewRenderer = Customization.of(req).viewRenderer();
		U.must(viewRenderer != null, "A view renderer wasn't configured!");

		PageRenderer pageRenderer = Customization.of(req).pageRenderer();
		U.must(pageRenderer != null, "A page renderer wasn't configured!");

		boolean rendered;
		String viewName = resp.view();
		ByteArrayOutputStream out = new ByteArrayOutputStream();

		MVCModel basicModel = new MVCModel(req, resp, resp.model(), resp.screen(), result);

		Object[] renderModel = result != null
			? new Object[]{basicModel, resp.model(), result}
			: new Object[]{basicModel, resp.model()};

		try {
			rendered = viewRenderer.render(req, viewName, renderModel, out);
		} catch (Throwable e) {
			throw U.rte("Error while rendering view: " + viewName, e);
		}

		String renderResult = rendered ? new String(out.toByteArray()) : null;

		if (renderResult == null) {
			Object cnt = U.or(result, "");
			renderResult = new String(HttpUtils.responseToBytes(req, cnt, MediaType.HTML_UTF_8, null));
		}

		try {
			Object response = U.or(pageRenderer.renderPage(req, resp, renderResult), "");
			return HttpUtils.responseToBytes(req, response, MediaType.HTML_UTF_8, null);

		} catch (Exception e) {
			throw U.rte("Error while rendering page!", e);
		}
	}