CSS Manager: Edit File Error

Hello,
when I open a CSS file via the CSS Manager and after then try to save it, I get this error message:

An error has occurred.
0 Joomla\CMS\Event\Model\SaveEvent::onSetSubject(): Argument #1 ($value) must be of type object, array given, called in /home/uxxxxxx/domains/pxxxx[.]com/public_html/libraries/src/Event/AbstractEvent[.]php on line 225

Joomla: 5.0.3
JEM: 4.2.0

Thank you in advance for your support and for this great extension,

Greetings,
Fikri

Thank you for your post. I posted it on github too. The problem is that this happens not always. Now we have to find the reason. If you can continue to observe, we are thankful.

Hi, thanks for the quick response.

I can send you the complete PHP error script.
I just don't want to send it public, otherwise I have to blacken too much.
Please let me know if you want the complete PHP error script.

Thank you in advance for your support and for this great extension,

Greetings,
Fikri

I think I have it from my site and posted it in github. The problem is, that at this moment the PM here isn't working.
Thanks

Can you send the php error script (write **** in your sensible data)?
it help me to know the point before in JEM.
And other, you can install beta JEM 4.2.1 github.com/jemproject/JEM-Project/commit/18ccdace4bf8e7af9304cd19a056f36da23ace4f and try it again.

Hello,

the PHP script as pdf attachment!

Greetings Fikri