java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

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Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
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 com.example.sathishbabus.loginapp_prabheesh.BackgroundTask.onPostExecute(BackgroundTask.java:109)	at com.example.sathishbabus.loginapp_prabheesh.BackgroundTask.onPostExecute(BackgroundTask.java:30)	at android.os.AsyncTask.finish(AsyncTask.java:651)