unhandled exception org.json.jsonexception

I, i work for an android app, the app must save a java object in json format into the SQLite database, i write the code for this operation, then they must extract the Json object and reconverting it in a Java Object. When I try to call the method for deserialize the json object in to a string i found this error in Android Studio:unhandled exception org.json.jsonexception

When I try to catch JSONException e the program run but don't deserialize the json object.

this is the code of the method:

private void read() throws JSONException {
    SQLiteDatabase db = mMioDbHelper.getWritableDatabase();
    String[] columns = {"StringaAll"};
    Cursor c = db.query("Alle", columns, null, null, null, null,null );
    while(c.moveToNext()) {
        String stringaRis =  c.getString(0);
        JSONObject jObj = new JSONObject(stringaRis);
        String sPassoMed = jObj.getString("passoMed");
        final TextView tView = (TextView) this.findViewById(R.id.mainProvaQuery);
        tView.setText(sPassoMed);
        // }
    }
}

Can you help me please?