#fixed code
                             public void complete(Channel ctx, boolean isKeepAlive, Req req, Object result) {

		if (result == null) {
			http.notFound(ctx, isKeepAlive, this, req);
			return; // not found
		}

		if (result instanceof HttpStatus) {
			complete(ctx, isKeepAlive, req, U.rte("HttpStatus result is not supported!"));
			return;
		}

		if (result instanceof Throwable) {
			HttpIO.errorAndDone(req, (Throwable) result);
			return;

		} else {
			HttpUtils.resultToResponse(req, result);
		}

		// the Req object will do the rendering
		if (!req.isAsync()) {
			req.done();
		}
	}
#vulnerable code 
                             public void complete(Channel ctx, boolean isKeepAlive, Req req, Object result) {

		if (result == null) {
			http.notFound(ctx, isKeepAlive, this, req);
			return; // not found
		}

		if (result instanceof HttpStatus) {
			complete(ctx, isKeepAlive, req, U.rte("HttpStatus result is not supported!"));
			return;
		}

		if (result instanceof Throwable) {
			HttpIO.errorAndDone(req, (Throwable) result, Customization.of(req).errorHandler());
			return;

		} else {
			HttpUtils.resultToResponse(req, result);
		}

		// the Req object will do the rendering
		if (!req.isAsync()) {
			req.done();
		}
	} 
                            #location 14 
                            #vulnerability type NULL_DEREFERENCE