org.json.JSONException: Value null of type org.json.JSONObject$1 cannot be converted to JSONObject code example

Example: org.json.JSONException: Value null of type org.json.JSONObject$1 cannot be converted to JSONObject

String crappyPrefix = "null";

if(result.startsWith(crappyPrefix)){
    result = result.substring(crappyPrefix.length(), result.length());
}
JSONObject jo = new JSONObject(result);