[wp-trac] [WordPress Trac] #58188: is_user_logged_in can cause null pointer exception

[WordPress Trac]

#58188: is_user_logged_in can cause null pointer exception
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 Reporter:  preissdigital  |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  General        |    Version:  6.2
 Severity:  normal         |   Keywords:
  Focuses:                 |
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 The `wp_get_current_user` has as documented return type a `WP_User`
 object. But it returns the result from `_wp_get_current_user` where the
 result can also be `0`. The problem is, that the `is_user_logged_in`
 function try to return `$user->exists()`. There should be a check like `0
 !== $user`, `$user instanceof \WP_User` or something similar.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58188>
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