onShowFileChooser() only works once

Question

I have an Android application consuming a web page and implementing some functionality for the user. The problem appears when I try to attach media files from Android device to send to server more than once; it crashes. The onShowFileChooser() method is only called once and then stops working, I encountered the same problem here and tried to implement all the proposed solutions but could not solve, what I am doing wrong?

Method onShowFileChooser:

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
    if(mFilePathCallback != null)
        mFilePathCallback.onReceiveValue(null);
    mFilePathCallback = filePathCallback;

    Log.d("DEBUG", "onShowFileChooser() ACIONADO!");

    Intent intent = null;
    if (fileChooserParams.getAcceptTypes()[0].contains(IMAGE_TYPE) &&
            fileChooserParams.getAcceptTypes()[0].contains(VIDEO_TYPE))
        intent = createFileSelectIntent();
    else if (fileChooserParams.getAcceptTypes()[0].contains(IMAGE_TYPE))
        intent = createPictureIntent();
    else if(fileChooserParams.getAcceptTypes()[0].contains(VIDEO_TYPE))
        intent = createVideoIntent();

    if (intent!=null)
        startActivityForResult(intent, INPUT_FILE_REQUEST_CODE);
    return true;
}

Method onActivityResult:

@Override
public void onActivityResult (int requestCode, int resultCode, Intent data) {
    if(requestCode == INPUT_FILE_REQUEST_CODE) {

        if (mFilePathCallback != null) {
            Uri[] results = new Uri[]{};

            if (resultCode == Activity.RESULT_OK) {

                FileBean fileBean = null;
                if (data != null && data.getDataString()!=null) {
                    String dataString = data.getDataString();
                    Uri uri = Uri.parse(Utils.getRealPath(this, dataString));
                    fileBean = new FileBean(uri, Utils.getFileType(uri.getPath()));
                }
                else if (filePath != null)
                    fileBean = new FileBean(Uri.parse(filePath), Utils.getFileType(filePath));

                if (fileBean != null) {
                    ApplicationStateSingleton.getInstance().getFileBeanList().add(fileBean);
                    results = new Uri[]{fileBean.getUri()};
                }
            }

            mFilePathCallback.onReceiveValue(results);
            mFilePathCallback = null;
            return;
        }

        if (mFilePathCallbackKitKat != null) {
            Uri result = null;

            if (resultCode == Activity.RESULT_OK) {

                FileBean fileBean = null;
                if (data != null && data.getDataString()!=null) {
                    String dataString = data.getDataString();
                    Uri uri = Uri.parse(Utils.getRealPath(this, dataString));
                    fileBean = new FileBean(uri, Utils.getFileType(uri.getPath()));
                }
                else if (filePath != null)
                        fileBean = new FileBean(Uri.parse(filePath), Utils.getFileType(filePath));

                if (fileBean != null) {
                    ApplicationStateSingleton.getInstance().getFileBeanList().add(fileBean);
                    result = fileBean.getUri();
                }
            }

            mFilePathCallbackKitKat.onReceiveValue(result);
            mFilePathCallbackKitKat = null;
            return;
        }
    }

    super.onActivityResult(requestCode, resultCode, data);
}

These are the classes that I think are relevant to solving the problem, but if you need more code fragments, let me know.