[wp-trac] [WordPress Trac] #49094: preg_match() expects parameter 2 to be string on line 417 of wp-includes/class-wp-block-parser.php

[WordPress Trac]

#49094: preg_match() expects parameter 2 to be string on line 417 of wp-includes
/class-wp-block-parser.php
--------------------------+------------------------------
 Reporter:  thenerdcave   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  5.3.2
 Severity:  critical      |  Resolution:
 Keywords:                |     Focuses:
--------------------------+------------------------------
Changes (by philippmuenchen):

 * severity:  normal => critical


Comment:

 On WP 5.4 this also breaks the Customizer when saving WP-Customizer fields
 that save arrays to theme_mod instead of strings. Example:

 On "publish" in Customizer, wp-ajax.php is called with the parameter
 {{{
 &customized=%7B%22global_typo_copy%22%3A%7B%22font-
 family%22%3A%22Lato%22%2C%22font-weight%22%3A400%7D%2C%22global_typo_copy
 %5Bfont-family%5D%22%3A%22Lato%22%7D
 }}}

 The saving fails with
 {{{
 preg_match() expects parameter 2 to be string, array given at
 /Volumes/Webprojekte/sueco.de/web/wp/wp-includes/class-wp-block-
 parser.php:417
 }}}
 and the Customizer breaks without updating the value.

 @thenerdcave suggestion fixes it for me, too.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/49094#comment:2>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform