Hi,
I have just tried and for me works:
Environment same as your: Joomla 3.8.12 - Kunena 5.1.4 - Easy Profile 2.5.7

Unfortunately this is a generic error, have you some more details from PHP error log?

NOTE: this integration is not developed by us, the plugin called "Kunena - Easyprofile Integration" is a part of Kunena

I have gotten around the "500 Internal Server Error" and all seems to be working fine except now that Easy Profile has taken over the Kunena Profile management there is no way to change the signature field for Kunena. Is this on your end or Kunena?

Hi and sorry for late reply.

except now that Easy Profile has taken over the Kunena Profile management

Probably you can change this behavior from "Kunena - Easyprofile Integration" plugin, but this way make 2 profile pages and I think this is not a good way.

Anyway there is a way that allow you to add Signature field in Easy Profile, basically you can add a field in Easy Profile and develop a small plugin that copy the value of this field in Kunena database table where is stored the Kunena signature. See instruction to make this plugin at https://www.easy-profile.com/support/kunena-signature.html

I followed the the instructions for the plugin. This is what I have in the plugin:

<?php
public function triggerProfileUpdate($user,&$data,$changed,$isNew)
{
if($user->id && isset($data['signature'])){
$signature = $data['signature'];
$db = JFactory::getDbo();
$query = 'UPDATE #__kunena_users SET signature = '.$db->quote($signature). ' WHERE userid = '. (int) $user->id;
$db->setQuery($query);
$db->execute();
}
}
?>

Once installed nothing seems to work. My field I created in Easy Profile is Signature with an alias of 'signature'.

I installed the plugin again and now I am getting the following error when I open my website.
0
SYNTAX ERROR, UNEXPECTED 'PUBLIC' (T_PUBLIC), EXPECTING END OF FILE

If I disable the plugin or uninstall it the website returns to normal.

Hi,
seems that you have removed entire code from skeleton.php file, instead to remove only functions triggerFieldAvatarUpdate, triggerProfileUpdate

try to follow these steps:
- delete file skeleton.php
- re-install skeleton plugin
- open file skeleton.php
- remove only functions triggerFieldAvatarUpdate and triggerProfileUpdate
- copy your code into class called "PlgJsnSkeleton"

Thank you for pointing out the error in my way. I deleted to much of the original skeleton.php script before I pasted in the new. The plugin now works like a champ.

Thanks for staying with me on this...