"LogicException: An anonymous user must be identifed by session ID."

The signature of getAllEntityFlaggings() has changed in the latest alpha.

(BTW there is no point in tagging an issue with 'bug', since the category field already tells you that!)

You are calling that method incorrectly.

You installed the new version of the module, but because the module is still in alpha, the API has changed.

message_subscribe_email_flag_action_access() is calling it wrong. It's not part of Flag. You need to change that code, or if it's another contrib module, get that module's maintainer to change it.

A related issue has been created for message_subscribe: https://github.com/Gizra/message_subscribe/issues/102

This solved mine (at least the error is gone).

I simply located the Flag module and edited the file modules/flag/src/FlagService.php

On line 193 up to line 195, I commented those out

i.e.

/** DISABLED {
*throw new \LogicException('An anonymous user must be identifed by session ID.');
} */

For now, I don't have any issues, although I'm not really sure of the implications of this action.

In my case https://github.com/Gizra/message_subscribe/issues/102 fixes the problem.

For me it was message_subscribe_email module and the patch from here fixed:
https://www.drupal.org/project/message_subscribe/issues/2928789

In my case. The issue was that $account was not null but $session_id was.
That being said. Here is the patch that check if both variables (account and session_id) are null

#13 did the trick for me.
thanks!

updating my last reply, #13 should not be applied. See problem description: https://www.drupal.org/project/flag/issues/3075108#comment-13224836

Hm,

I get it on /user/register and not at other pages (as it seem now for me) ...

I had the whole message stack installed too, so maybee there is a relation.

After uninstalling Message Digest UI:

Error: Call to undefined function message_digest_allowed_values_callback() in options_allowed_values() (Line 89 in /core/modules/options/options.module)

After
Message Subcribe Email
Message Subscribe UI
Message Subscribe

same Error as above

After unistalling Message Digest:

Error: Call to a member function getPath() on null in Drupal\config_translation\ConfigNamesMapper->getOverviewRoute() (Line 247 in /core/modules/config_translation/src/ConfigNamesMapper.php)

and for anonymous users:

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "message_digest_interval" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() (Line 150 in /core/lib/Drupal/Core/Entity/EntityTypeManager.php).

/user/register still doesnt work!

I wonder how this issue can be closed if it is not fixed!

If new users cant register, its major for me!

Followed instruction of https://www.drupal.org/project/message_digest/issues/3095573 and removed field.storage.user.message_digest and also field.storage.user.message_subscribe_email. Register still doesnt work, same error message related to message module ...

@turtletrail got it right patch #13 should not be used. The problem in first place in my case wast that anonymous users should not have acces to content where flag is used. I fix this with redirect to login path.

I encountered the same problem on a test D8 installation.

I deleted the Message Subscribe module's flags for term and user (so, just leaving its content flag), and this *appears* to have resolved the problem with the registration page.

Fortunately for me, I only need the content flag.

Sharing just in case somebody else has the same use case.

Moving this issue to the right project.

This patch is needed to fix it:
https://github.com/hdpe/message_subscribe/commit/9ca5e6082640b088087ae04...

Here's @hansrossel's patch in cweagans/composer-patches consumable form. Note that I applied his patch to the 1.1 version, not 8.x-1.x-dev as originally specified by @hansrossel.

New to cweagans/composer-patches?
Add something like this to your composer.json:

{
  "extra": {
    "patches": {
      "drupal/message_subscribe":{
        "LogicException: An anonymous user must be identifed by session ID, https://www.drupal.org/project/message_subscribe/issues/2880521#comment-14186786":"https://www.drupal.org/files/issues/2021-10-03/message_subscribe-1.1.0--2880521-24--anonymous-user-must-be-identifed-by-session-id_flag-compatibility-issue.patch"
      }
    }
  }
}

Patch #24 works. Maintainers, please change the status to something else.

This is a dupe of Causes fatal exception with flag module

This issue has been moved, but since it's closed, it won't probably be noticed. (I just found it because I was looking at the recently posted comments.)

It's probably better to open a new issue with the details useful to the maintainers of this project.

(Actually, as comment #26 says, there is already an issue opened for this.)