My Dev server shows me every troubles even PHP Notices in the page. My Prod server of course not.
Could you modify your plugin to avoid notices with $_POST variables ?
I mean regarding to the settings, notices may be displayed.
My plugin is configured to NOT ask for an image/logo, but after submitting a notice is displayed: Notice: Undefined index: website_image in (...)\plugins\ultimate-blogroll\domain\UbPage.php on line 120
Same thing for this, if i don't want any backlink:
Notice: Use of undefined constant website_backlink - assumed 'website_backlink' in ultimate-blogroll\persistence\UbLinkpartnerMapper.php on line 169
Do you see what i mean ? there are other notices but i need to understand your code.