Uncaught TypeError: Cannot read property ‘firstChild’ of null after upgrading to WordPress 5.5

This was fixed in 5.5.1, commit 48877:

Correct the check for reply element existence in comment-reply.js.

document.getElementById() returns null if no matching element was found, so the previous comparison didn’t work as expected.

Related Posts:

  1. How to preserve PHP modifications while upgrading WordPress?
  2. How do I fetch all comments per post via WP REST API?
  3. Trying to implement Ajax comments in WordPress, getting WP error
  4. How does this WordPress Plugin (Thrive Comments) apply their custom comment sort? [closed]
  5. Customize Theme comment template to Insert VoteUp and VoteDown buttons
  6. Ajax load more button for comments wordpress
  7. Trouble figuring out how to get my button to submit comment
  8. WordPress Visual Editor Stripping HTML Changes
  9. WordPress Admin Bar pushed Sticky Footer off the bottom of the page
  10. Add a class to links in the visual editor (how to get old dialog back)
  11. How to remove hardcoded characters from playlists?
  12. Gutenberg Blocks doesn’t render correctly when using do_blocks
  13. Calling a method from functions.php on a click of a button
  14. Get post meta in enqueued js file
  15. How to use WordPress (PHP) functions in AngularJS partials files?
  16. How to create a custom config file and get data using inline JS in a wordpress page
  17. How do I create comment-reply-button using element not
  18. API JSON Data in WordPress
  19. Archive dropdown styling not applied
  20. using woocommerce_template_single_add_to_cart in shop-loop – javascript issues [closed]
  21. Automatically generate Post/Page from searched Database item?
  22. WordPress errors with PhP Upgrade
  23. How to speed up admin-ajax.php in wordpress
  24. JQuery not working on WordPress Admin page [closed]
  25. Putting PHP variables into javascript [duplicate]
  26. Ajax not working es expected (Returns 0)
  27. Use menu link or onClick to set a variable
  28. Status 400 for AJAX POST Request with admin-ajax.php
  29. Incorrect MIME type for assets with Valet
  30. Media Upload , file name changed automatically
  31. Generate sidebar depending on height of post
  32. How to add specific meta tags to head of cart and checkout pages in woocommerce?
  33. How to correctly add Javascript to this PHP ‘Page Not Found’ Page?
  34. Get post id within comments loop
  35. Error – ‘create_function is deprecated’ [closed]
  36. get taxonomy thumbnail and use it as a variable in code
  37. What are the advantages/disadvantages of using jQuery DOM manipulation as opposed to PHP DOM manipulation?
  38. Is it save to use eval for a jQuery callback method coming from the database?
  39. Get html data with javascript to php array and store to wordpress database
  40. trouble with page_id & highlighting current page
  41. Security updates to 3.3.2
  42. wordpress admin plugin menu custom css
  43. Load Posts on Click via Ajax into a DIV
  44. An audio player that showcase a random song from playlist every 24h [closed]
  45. How to Change CSS Colors from Custom Plugin Settings Page
  46. Passing the name of selected color from the custom component to `render_callback`
  47. After adding my website to a new server, I keep getting a unexpected end of file error, but the file is identitcal to it’s original source
  48. How to allow download url redirection only if user logged in WordPress site?
  49. Why i can’t get custom fields value or post ID via Ajax?
  50. wp_localize_script() and JavaScript namespaces
  51. Cannot access $wpdb, comes back NULL
  52. get_comments_number() returns 0
  53. How to reference PHP in Javascript
  54. get db values for external js file
  55. Accessing an API with jQuery and AJAX
  56. Ajaxurl suddenly not defined
  57. WordPress – Get Posts with Category data
  58. How to use wp_send_json() and output the value with ajax?
  59. How to store checkbox data for individual users?
  60. html form: redirect page after form completes submit function and posts data
  61. Creating a brand attribute as a variable
  62. comment_post (if comment is approved OR $comment_approved === 1) not working?
  63. Cannot find the php_ini configuration file to find my error log to see why my code is not working
  64. Add other class content with reference class value
  65. Gutenberg block don’t save rich text content
  66. Creating a POP Alert
  67. How do I integrate vanilla Javascript to a wordpress website?
  68. Hide Approved status for certain users in users list
  69. WordPress Slider is not working
  70. Comments on my custom post type
  71. Pulling Products from an API
  72. Filtering markers on google map by WordPress category[SOLVED]
  73. Call jQuery function from PHP?
  74. How to call a function from functions.php with ajax?
  75. Custom Post type Ajax search results
  76. include javascript Multiple files in wordpress through script.js
  77. Ajax wordpress function showing source code in alert and not value of input field?
  78. Real time notification on user profile after new comment
  79. I want url from a file in media using title file
  80. scroll scrpit to particular button position to next id when click button
  81. make an array in wordpress cusmization api?
  82. Retrieve $_POST data to send to javascript without using localize script
  83. Add a downloaded JS file to WordPress
  84. Querying latitude and longitude into google maps correctly
  85. Getting most popular posts based on Facebook comments count
  86. A Space being added to url generated by custom plugin
  87. Why this plugin is not working?
  88. Trying to fix multiple category drop down
  89. Warning: preg_replace(): Compilation failed: unknown option bit(s) set at offset -1
  90. Custom action on comment post
  91. js code not stored in database currectly
  92. Facebook share button only share the_permalink(), without thumbnail, tilte, excerpt, etc
  93. get_option(‘admin_email’) not working in wordpress when using ajax call
  94. How to convert my comment.html to comment.php
  95. Passing javascript variable to php file
  96. Upgrade wordpress core programmatically with PHP [closed]
  97. Javascript code not working – $ is not a function error
  98. Disable Typed Parameters for JavaScript in PhpStorm? [closed]
  99. Losing Session ID and sessionStorage when navigating to other domains on Multisite
  100. How can I use AJAX in child theme template?
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)