[4.0] Front end module edit function fails to save

[b10tds]

Steps to reproduce the issue

J400 totally default vanilla installation.
Login as a super-user.
Edit default image module from the home page using the displayed module edit button.
With, or without, making any changes in the editor, select either of the Save options.

Also in the front end the [edit] button is still displayed AND appears active when you are editing.

Expected result

Correct saving of any change and clean exit.

Actual result

Following error message appears on blank white screen:
{"error":true,"code":0,"message":"Call to a member function getType() on null"}

System information (as much as possible)

PHP 7.2.0
MySQLi 8.0.16
Caching Disabled
Gzip Disabled
Users 1
Articles 6

Additional comments

Same error occurs no matter which editor is used.
In the back end (Admin CP) it edits and save correctly, no matter which editor is used.

[Quy]

Please make sure you are testing with the nightly builds.
https://developer.joomla.org/nightly-builds.html

[richard67]

J400 totally default vanilla installation.
Login as a super-user.
Edit default image module from the home page using the displayed module edit button.

@b10tds I'm confused because on a Joomla 4 "default vanilla installation" there is no "default image module from the home page". What kind of module is it? Have you created it, or have you installed some kind of sample data after the installation? Please report back all details we need to reproduce the issue.

[b10tds]

My apologies, yes I used the "add sample data" option in the admin CP after the install so there was some content to see how it worked.

[richard67]

@b10tds Which one? Blog sample data? Or multilingual sample data?

[b10tds]

Blog sample.

[richard67]

@b10tds Language of backend and frontend is the default "en-GB"?

[b10tds]

Yes

[infograf768]

What do you call the default image module from the home page ?
Please add a screenshot

[infograf768]

I see now which module is concerned.
No issue here:

[infograf768]

[richard67]

I can't reproduce either, same module as shown by @infograf768 .

[b10tds]

Okay thanks, I have just installed 4.0.0-beta1-dev version and tested that and it is not doing it, however this may be related to the change in PHP version required for this beta1-dev version to install from 7.2 to 7.3 to run.

[infograf768]

Closing this.