[wp-trac] [WordPress Trac] #45157: Upgrading from 4.9.9 to 5.0-alpha-43815 with Gutenberg plugin installed gets whitescreen of death

[WordPress Trac]

#45157: Upgrading from 4.9.9 to 5.0-alpha-43815 with Gutenberg plugin installed
gets whitescreen of death
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 Reporter:  timhibberd    |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.0
Component:  General       |     Version:  5.0
 Severity:  major         |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by timhibberd):

 I did a follow-up {{{grep -R "WP_REST_Blocks_Controller" *}}} on the
 WordPress directory and the fatal error that occurred in the Gutenberg
 plug-in {{{wp-content/plugins/gutenberg/lib/class-wp-rest-blocks-
 controller.php on line 0}}} might have been caused through collision with
 one of the following:

 {{{
 1) wp-includes/rest-api/endpoints/class-wp-rest-blocks-controller.php: *
 Reusable blocks REST API: WP_REST_Blocks_Controller class

 2) wp-includes/rest-api/endpoints/class-wp-rest-blocks-
 controller.php:class WP_REST_Blocks_Controller extends
 WP_REST_Posts_Controller {

 3) wp-includes/post.php: 'rest_controller_class' =>
 'WP_REST_Blocks_Controller',
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/45157#comment:9>
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