Error after upgrading WP from 4.0.6 -> 4.4.2: empty value in wp_post_types[‘post’]

What that error is saying is that $labels is an empty object, so it can’t assign to it.

$foo = NULL;
$foo->labels = false; // This causes the error

See this Stack Overflow post for technical details: https://stackoverflow.com/questions/8900701/creating-default-object-from-empty-value-in-php

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