Form settings error on save - new install from github

[mygunfriday]

Every time I edit the form settings I'm getting this error on save:

An error has occurred.
0 implode(): Argument #2 ($array) must be of type ?array, string given

I have a fresh Joomla install, fresh Fabrik with github updates. I did add Admin Tools - would that be causing this?
I'm not seeing this error saving anything else in Fabrik.
Thoughts?

 

[troester]

Is this with any form or a special one?

 

[mygunfriday]

Happened in the each of the first 2 forms I created.
Both simple forms - not much in them.
I added some intro text to the first.
I tried to add some php onload to the second.
Both gave the error.
The changes were saved, the form remained checked out. (Should've mentioned that.)

(Tried removing the text from the first form - same error. There are no changes otherwise.)

 

[troester]

Which php version?
Are you running the latest GitHub?
Does it give some file and line number?
Can you enable Joomla's system Debug to get the stack?

 

[mygunfriday]

PHP 8.0
Started with fresh Github on May 20 - saw the erro. Refreshed on June 9 - still seeing the error. I can refresh again - let me know.
Turned on Joomla's system debug and got the screenshot below.

 

[troester]

ok, Fabrik is not php8.0 ready
https://github.com/Fabrik/fabrik/commit/f17ef558d41c8f9cc45c98276242a3627b60a781

 

[mygunfriday]

Didn't even think of that.
Just dropped to 7.4 and no problem now.
Thanks Troester!