Integrity constraint violation: 1048 Column 'uid' cannot be null.

I added the line Worked but displays this issue:

Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /home/xx/public_html/x/includes/entity.inc).
Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 388 of /home/xx/public_html/x/includes/entity.inc).
Notice: Trying to get property of non-object in unsubscribe_user_check() (line 331 of /home/xx/public_html/x/sites/all/modules/unsubscribe/unsubscribe.module).

Looks like the fix was already added https://git.drupalcode.org/project/unsubscribe/-/commit/8efbdd6d45d6c3ff... but it didn't make it to the dev release for some reason.

Also the array flip problem was fixed in https://www.drupal.org/project/unsubscribe/issues/2387217 →

Automatically closed - issue fixed for 2 weeks with no activity.