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TypeError: 'undefined' is not an object

  • I’m using the Repeater plugin and I can’t remove/add sub fields anymore because of this JavaScript error:

    TypeError: ‘undefined’ is not an object (evaluating ‘this.toolbars[this.o.toolbar]’) in “input.min.js?ver=4.3.4”

  • Hi @Till

    Thanks for the bug report. The full line is:
    if( acf.helpers.isset( this.toolbars[ this.o.toolbar ] ) )

    And it looks like the isset function is not working as per expected.

    Is it possible that your WYSIWYG field contains a ‘toolbar’ setting that does not exist anymore?


  • That’s the PHP config that creates the field: — Anything wrong with it?

  • Hi @Till

    There is nothing wrong with the linked PHP, however the issue could be stemming from another field group.

    Are you able to debug the JS?
    1. Copy the contents from js/input.js
    2. Replace the contents of js/input.min.js
    3. Find the line with if( acf.helpers.isset( this.toolbars[ this.o.toolbar ] ) )
    3. Before this line, console.log the variables such as this.o.toolbar


  • Sure! See below. Need anything else?

    this.toolbars: undefined


        id: "wysiwyg-acf-field-field_52ba5d6289438_0_field_52ba64a564a1b-52fd8bc9b44f6"
        toolbar: "full"
        upload: "no"
        __proto__: Object
  • Hi @Till

    Thanks for the info.

    For some reason, your toolbars are not being added to the wysiwyg JS object. Normally, an array of toolbars will exist at acf.fields.wysiwyg.toolbars (this.toolbars).

    On line 115 of core/controllers/input.php you will see:
    acf.fields.wysiwyg.toolbars = <?php echo json_encode( $t ); ?>;

    It is possible that this line of script is not being run due to a JS error on the page. Can you check for any JS errors?

    Perhaps also do some PHP debugging to make sure line 115 is correct data?


  • Heya!

    This is the output:

    acf.fields.wysiwyg.toolbars = {
        "full": {
            "theme_advanced_buttons1": "bold,italic,strikethrough,bullist,numlist,blockquote,justifyleft,justifycenter,justifyright,link,unlink,wp_more,AtD,fullscreen,wp_adv",
            "theme_advanced_buttons2": "formatselect,underline,justifyfull,forecolor,pasteword,removeformat,charmap,outdent,indent,undo,redo,wp_help,code",
            "theme_advanced_buttons3": "",
            "theme_advanced_buttons4": ""
        "basic": {
            "theme_advanced_buttons1": "bold,italic,underline,blockquote,strikethrough,bullist,numlist,justifyleft,justifycenter,justifyright,undo,redo,link,unlink,fullscreen"
  • Hi @Till

    Your results show the correct data… I don’t understand why toolbars would be undefined…

    Chances are you have some conflicting JS in a plugin or theme which is modifying the ACF object.

    Are you able to install a fresh WP and, one by one, install your plugins / theme to see when the issue begins?


  • It’s happening with all plugins disabled as well, even if I remove the wysiwyg sub-field, but without js errors. I’ll do some debugging in the next few days and get back to you.

  • I just figured it out. I was messing with the acf/helpers/get_dir filter and the repeater input.js was never loaded… doh!

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