Hello Kasper,
As a quick workaround try to change line 312 in wplib/utils_easyform.inc.php from:
protected function handleSave() {}
to:
protected function handleSave($formValues) {}
And tell if it fixes the problem.
I also recommend you to change error_reporting level in your php.ini on production environment to ignore warning messages. You can find more information here:
https://php.net/manual/en/errorfunc.configuration.php#ini.error-reporting
I’m not sure what do you mean “it messes up many of the characters”.
Please, provide more information (a screenshot, for example).
Regards,
Dmitry
