#fixed code
                             private boolean handleError(Channel channel, boolean isKeepAlive, ReqImpl req, MediaType contentType, Throwable e) {
		if (req != null) {
			if (!req.isStopped()) {
				try {
					HttpIO.errorAndDone(req, e);
				} catch (Exception e1) {
					Log.error("HTTP error handler error!", e1);
					internalServerError(channel, isKeepAlive, req, contentType);
				}
			}
			return true;

		} else {
			Log.error("Low-level HTTP handler error!", e);
			internalServerError(channel, isKeepAlive, req, contentType);
		}

		return false;
	}
#vulnerable code 
                             private boolean handleError(Channel channel, boolean isKeepAlive, ReqImpl req, MediaType contentType, Throwable e) {
		if (req != null) {
			if (!req.isStopped()) {
				HttpIO.errorAndDone(req, e);
			}
			return true;

		} else {
			Log.error("Low-level HTTP handler error!", e);
			HttpIO.startResponse(channel, 500, isKeepAlive, contentType);
			byte[] bytes = HttpUtils.responseToBytes(req, "Internal Server Error!", contentType, routes()[0].custom().jsonResponseRenderer());
			HttpIO.writeContentLengthAndBody(channel, bytes);
			HttpIO.done(channel, isKeepAlive);
		}

		return false;
	} 
                            #location 11 
                            #vulnerability type NULL_DEREFERENCE