[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
--------------------------+---------------------
 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:
--------------------------+---------------------

Comment (by TimothyBlynJacobs):

 I also get a fatal when coming from bleeding edge nightlies (
 5.1-something or other ) and the Gutenberg plugin is active.


 {{{
 [24-Oct-2018 14:40:31 UTC] PHP Fatal error:  Cannot declare class
 WP_REST_Blocks_Controller, because the name is already in use in
 /app/public/wp-content/plugins/gutenberg/lib/class-wp-rest-blocks-
 controller.php on line 123
 [24-Oct-2018 14:40:31 UTC] PHP Stack trace:
 [24-Oct-2018 14:40:31 UTC] PHP   1. {main}() /app/public/wp-
 admin/about.php:0
 [24-Oct-2018 14:40:31 UTC] PHP   2. require_once() /app/public/wp-
 admin/about.php:10
 [24-Oct-2018 14:40:31 UTC] PHP   3. require_once() /app/public/wp-
 admin/admin.php:31
 [24-Oct-2018 14:40:31 UTC] PHP   4. require_once() /app/public/wp-
 load.php:37
 [24-Oct-2018 14:40:31 UTC] PHP   5. require_once() /app/public/wp-
 config.php:104
 [24-Oct-2018 14:40:31 UTC] PHP   6. include_once() /app/public/wp-
 settings.php:322
 [24-Oct-2018 14:40:31 UTC] PHP   7. gutenberg_pre_init() /app/public/wp-
 content/plugins/gutenberg/gutenberg.php:17
 [24-Oct-2018 14:40:31 UTC] PHP   8. require_once() /app/public/wp-
 content/plugins/gutenberg/gutenberg.php:164
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/45157#comment:11>
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