java.lang.RuntimeException: An error occurred while executing doInBackground()

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An error occurred while executing doInBackground()
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference	at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)	at org.json.JSONTokener.nextValue(JSONTokener.java:94)	at org.json.JSONObject.(JSONObject.java:156)	at org.json.JSONObject.(JSONObject.java:173)	at data.JSONWeatherParser.getWeather(JSONWeatherParser.java:23)	at com.example.bartek.weather.MainActivity$WeatherTask.doInBackground(MainActivity>.java:67)	at com.example.bartek.weather.MainActivity$WeatherTask.doInBackground(MainActivity>.java:60)	at android.os.AsyncTask$2.call(AsyncTask.java:304)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)	at java.lang.Thread.run(Thread.java:761)