[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 danielbachhuber):

 Worth noting that core defines the classes much earlier than plugins are
 loaded. However, GB compatibility with WP 5.0 only exists for GB 4.1
 (which isn't yet formally released), so if you're running GB 4.0 or
 earlier you can expect WordPress to fatal.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45157#comment:16>
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