[wp-trac] [WordPress Trac] #59103: Gutenberg 16.4 Footnotes Critical Bug on PHP 8.0

[WordPress Trac]

#59103: Gutenberg 16.4 Footnotes Critical Bug on PHP 8.0
---------------------------+-----------------------------
 Reporter:  orangeavocad0  |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Post Formats   |    Version:  6.3
 Severity:  critical       |   Keywords:  needs-patch
  Focuses:                 |
---------------------------+-----------------------------
 I am currently using WordPress version 6.3, PHP 8.0.

 There is no issue initially when creating a post with the footnotes block,
 and is able to publish the post.

 After a while, when trying to edit the same post again, I will see the
 critical error as such as seen in the attachment.

 {{{
 PHP Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be
 of type Countable|array, null given in
 /wordpress/plugins/gutenberg/16.4.0/build/block-
 library/blocks/footnotes.php:37 Stack trace: #0 /wordpress/core/6.3/wp-
 includes/class-wp-block.php(258):
 gutenberg_render_block_core_footnotes(Array, '', Object(WP_Block)) #1
 /wordpress/core/6.3/wp-includes/blocks.php(1133): WP_Block->render() #2
 /wordpress/core/6.3/wp-includes/blocks.php(1171): render_block(Array) #3
 /wordpress/core/6.3/wp-includes/class-wp-hook.php(310): do_blocks('<!-- wp
 :rank-ma...') #4 /wordpress/core/6.3/wp-includes/plugin.php(205):
 WP_Hook->apply_filters('<!-- wp:rank-ma...', Array) #5 /wordpress/core/6.3
 /wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(1864):
 apply_filters('the_content', '<!-- wp:rank-ma...') #6 /wordpress/core/6.3
 /wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(569):
 WP_REST_Posts_Controller->prepare_item_for_response(Object(WP_Post),
 Object(WP_REST_Request)) #7 /wordpress/core/6.3/wp-includes/rest-api
 /class-wp-rest-server.php(1188):
 WP_REST_Posts_Controller->get_item(Object(WP_REST_Request)) #8
 /wordpress/core/6.3/wp-includes/rest-api/class-wp-rest-server.php(1035):
 WP_REST_Server->respond_to_request(Object(WP_REST_Request),
 '/wp/v2/posts/(?...', Array, NULL) #9 /wordpress/core/6.3/wp-includes
 /rest-api.php(545): WP_REST_Server->dispatch(Object(WP_REST_Request)) #10
 /wordpress/core/6.3/wp-includes/rest-api.php(2911):
 rest_do_request(Object(WP_REST_Request)) #11 [internal function]:
 rest_preload_api_request(Array, '/wp/v2/posts/57...') #12
 /wordpress/core/6.3/wp-includes/block-editor.php(743): array_reduce(Array,
 'rest_preload_ap...', Array) #13 /wordpress/core/6.3/wp-admin/edit-form-
 blocks.php(77): block_editor_rest_api_preload(Array,
 Object(WP_Block_Editor_Context)) #14 /wordpress/core/6.3/wp-
 admin/post.php(187): require('/wordpress/core...') #15 {main} thrown in
 /wordpress/plugins/gutenberg/16.4.0/build/block-
 library/blocks/footnotes.php on line 37
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/59103>
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