Blank page processing donation

May be somebody has got this error too.

When i click the process donation button i will directed to a blank page. I tried multiple donate configurations.
This is the param part of the url which results in the blank page:
?option=com_jdonation&view=donation&campaign_id=1&ItemId=392
The same result occurs when i activate SEO friendly urls.

Here are some settings of the environment in which the error occurs:
- Windows 10 (64-Bit)
- Joomla 3.8.1 Stable
- Php-Version 5.6.40
- DB-Version 5.6.42
- Webserver Apache 2.4.37
- JoomDonation 5.5.0
- Firefox Quantum 65.0.2 (64-Bit) / Microsoft Edge

Hi,
We should check the problem before we can let you know the reason of issue. There are many reasons, and we can't leave any reason with blank page issue.
Hope you understand.
Thanks
Dam

The cause seemed to be that i deactivated the Joomla captcha plugin for some reasons.
It works again after i made the following changes in file "/components/com_jdonation/controller/donation.php"

I replaced code line
$res = JCaptcha::getInstance($captchaPlugin)->checkAnswer($this->input->post->get('recaptcha_response_field', '', 'string'));
with
if ($captchaPlugin === 0 || $captchaPlugin === '0') {
$res = true;
} else {
$res = JCaptcha::getInstance($captchaPlugin)->checkAnswer($this->input->post->get('recaptcha_response_field', '', 'string'));
}

OK, you should check your Captcha plugin to make sure it is configured properly.
Thanks
Dam

I too am getting a blank page on submit (Stripe Checkout). The above code did not work, neither did the default. Yes - all server and client caches were cleared.

Chrome, at least responds with

This page isn’t working

<actual domain url> is currently unable to handle this request.
HTTP ERROR 500

Hi,
Please submit ticket on category: Joom Donation and provide your site url with super admin account. I'll check the issue on Stripe Checkout for you
Thanks
Dam

FBO others - the plugin needed to be reinstalled for some reason.

And the issue is solved now?
Dam