Blank page on Editor after 5.0 update on Editor/Author users

Hello ????

You can find the Classic Editor here and install it as you would any other plugin.

However, it would be worth spending a few minutes trying to resolve this – if only because the solution to your problem may help many others!

First of all, can you try clearing the cache from your browser (ideally use a different browser than you usually do)? If that doesn’t work, do you know how to display JavaScript errors? If you’re using Chrome, it will be View -> Developer -> JavaScript Console. If you start that and then go into the editor, it should (hopefully) display some errors. Cut and paste them here and it will give us a clue as to what may be going wrong.

5.0 *will* work fine, but the chances are that you simply have a conflict somewhere that’s causing it to stop (for example, an older version of Jetpack is known to cause this).

Hi, on one of my sites I have the same issue like @vipini: blank page after clicking “add new post” or “add new page”.

I tried to deactive all plugins, clear cache. It didn’t help.

I have 3 errors in console:

1) first appeared after logging-in:
Uncaught SyntaxError: missing ) after argument list (post-new.php:2039)

2) second and third errors appear after clicking “add new post”:
Uncaught SyntaxError: Unexpected identifier (post-new.php:2107)
Uncaught SyntaxError: Unexpected identifier (post-new.php:2203)

I suspect this is going to be either 1 of 2 issues – an bad installation or an issue caused by another plugin.

I’d therefore suggest deactivating all plugins. Does it work then? If it does, re-activate one at a time to identify the cause.

Also try switching to a different theme temporarily – Twenty Nineteen, for instance.

If neither of those resolve the issue, it would be worth re-installing WordPress again. If you need help with this process, let me know and I’ll provide some further detail.

Tested reinstalling wordpress and deactivated plugins but still having a blank page on page edits.

Having these errors on wordpress admin dashboard as well, might be related:

Uncaught SyntaxError: missing ) after argument list
19:19:51.725 backbone.min.js:1 Uncaught TypeError: Cannot read property 'extend' of undefined
    at backbone.min.js:1
    at backbone.min.js:1
    at backbone.min.js:1
19:19:51.725 wp-backbone.min.js:1 Uncaught ReferenceError: Backbone is not defined
    at wp-backbone.min.js:1
    at wp-backbone.min.js:1
19:19:51.726 media-models.min.js:1 Uncaught TypeError: Cannot read property 'extend' of undefined
    at Object.20 (media-models.min.js:1)
    at b (media-models.min.js:1)
    at media-models.min.js:1
    at media-models.min.js:1
19:19:51.726 wp-plupload.min.js:1 Uncaught TypeError: Cannot read property 'Attachments' of undefined
    at wp-plupload.min.js:1
    at wp-plupload.min.js:1
19:19:51.736 media-views.min.js:1 Uncaught TypeError: Cannot set property 'l10n' of undefined
    at Object.<anonymous> (media-views.min.js:1)
    at b (media-views.min.js:1)
    at media-views.min.js:1
    at media-views.min.js:1
19:19:51.736 media-editor.min.js:1 Uncaught TypeError: Cannot read property 'settings' of undefined
    at media-editor.min.js:1
    at media-editor.min.js:1
19:19:51.737 media-audiovideo.min.js:1 Uncaught TypeError: Cannot read property 'settings' of undefined
    at Object.<anonymous> (media-audiovideo.min.js:1)
    at b (media-audiovideo.min.js:1)
    at media-audiovideo.min.js:1
    at media-audiovideo.min.js:1
19:19:51.737 mce-view.min.js:1 Uncaught ReferenceError: Backbone is not defined
    at mce-view.min.js:1
    at mce-view.min.js:1
19:19:51.742 wp-api.min.js:1 Uncaught TypeError: Cannot read property 'isFunction' of undefined
    at wp-api.min.js:1
    at wp-api.min.js:1
19:19:52.606 jquery.flot.resize.min.js:1 Uncaught TypeError: Cannot set property 'w' of undefined
    at n (jquery.flot.resize.min.js:1)
    at dispatch (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,underscore,wp-util,wp-a11y,updates,jquery-ui-core,jquery-ui-widget,moxiejs,plupload&ver=5.0.1:3)
    at r.handle (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,underscore,wp-util,wp-a11y,updates,jquery-ui-core,jquery-ui-widget,moxiejs,plupload&ver=5.0.1:3)

@midnitedev do you have any custom code added in functions.php? For me this code caused error.

Yes, I do, lots of it actually. I’ll try minimizing it to see if that’s the cause of the issues.

For me that snippet caused error:

// Remove type attribute from script and style tags added by WordPress
add_filter('script_loader_tag', 'clean_script_tag');
  function clean_script_tag($input) {
  $input = str_replace("type='text/javascript' ", '', $input);
  return str_replace("'", '"', $input);
}

I followed @pzxyz’s suggestion on testing the custom code for functions.php. Turns out, it was these 2 code snippets that were meant to optimize my results on web tools that were the culprit:

/***** Start: Defer parsing of javascript *****/
function defer_parsing_of_js ( $url ) {
  if ( FALSE === strpos( $url, '.js' ) ) return $url;
  if ( strpos( $url, 'jquery.js' ) ) return $url;
  return "$url' defer='defer";
}
add_filter( 'clean_url', 'defer_parsing_of_js', 11, 1 );
/***** End: Defer parsing of javascript *****/

/***** Start: Remove query string from static resources *****/
function _remove_script_version( $src ){
  $parts = explode( '?', $src );
  return $parts[0];
}
add_filter( 'script_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', '_remove_script_version', 15, 1 );
/***** End: Remove query string from static resources *****/

I commented them out and got no errors anymore. Even got the blank page on editor issue resolved as well.

*Additional note: I was using the autoptimizer plugin and I had to disable minification on javascript and css files. This solved issues on console errors on post pages.

• This reply was modified 5 years, 11 months ago by midnitedev.

I am in big trouble with this problem – please help me asap!!!

Edit page was blank so tried updating Safari (not a solution), disabling plug-ins (not a solution) then madw a HUGE mistake by changing thmes to Twenty Ninteen as advise dabove and now I no longer have a website!!!!

FIRST OF ALL how do I get my theme back? Secondly what is the solution to the blank edit page if I have tried the above?

This website is crucial to my business and I fear I am losing every hour that this is not resolved.

Please help – thank you!!!!!!

@katherinefoodwisdom you have made a lot of errors being result of bad methodology of work with WP

1. Contact your hosting company maybe they have a daily backup of your page and can restore it.

2. Backup your page using some plugin. There’s a whole topic about it in Codex.

3. Do you have any custom code added in functions.php?

@pzxyz I had the exact same issue with the exact same snippet. Thank you, helped a lot!