Fatal error on “Save change to theme”: Uncaught TypeError in theme-fonts.php

I am building a new website using the Twenty Twentyfour theme. I added Roboto and Robot Slab to replace the default fonts (Inter/Jost). I also added a few custom colors.

In the block editor when I click the wrench icon to open the Create Block Theme menu and then click “Save Changes to Theme” > Save Changes, I get an error.

Request Data

URL: /wp-json/create-block-theme/v1/save?_locale=user
Method: POST
Data:

• localizeImages: false
• localizeText: false
• processOnlySavedTemplates: true
• removeNavRefs: false
• saveFonts: true
• saveStyle: true
• saveTemplates: true

Response Data

• “code”: “internal_server_error”,
• “message”: “There has been a critical error on this website. Learn more about troubleshooting WordPress.“,
• “data”: {
  • “status”: 500,
  • “error”: {
    • “type”: 1,
    • “message”: “Uncaught TypeError: basename(): Argument #1 ($path) must be of type string, array given in \wp-content\plugins\create-block-theme\admin\create-theme\theme-fonts.php:117
      Stack trace:
      #0 \wp-content\plugins\create-block-theme\admin\create-theme\theme-fonts.php(117): basename(Array)
      #1 \wp-content\plugins\create-block-theme\admin\create-theme\theme-fonts.php(11): Theme_Fonts::remove_deactivated_fonts_from_theme()
      #2 \wp-content\plugins\create-block-theme\includes\class-create-block-theme-api.php(444): Theme_Fonts::persist_font_settings()
      #3 \wp-includes\rest-api\class-wp-rest-server.php(1230): Create_Block_Theme_API->rest_save_theme(Object(WP_REST_Request))
      #4 \wp-includes\rest-api\class-wp-rest-server.php(1063): WP_REST_Server->respond_to_request(Object(WP_REST_Request), ‘/create-block-t…’, Array, NULL)
      #5 \wp-includes\rest-api\class-wp-rest-server.php(439): WP_REST_Server->dispatch(Object(WP_REST_Request))
      #6 \wp-includes\rest-api.php(428): WP_REST_Server->serve_request(‘/create-block-t…’)
      #7 \wp-includes\class-wp-hook.php(324): rest_api_loaded(Object(WP))
      #8 \wp-includes\class-wp-hook.php(348): WP_Hook->apply_filters(”, Array)
      #9 \wp-includes\plugin.php(565): WP_Hook->do_action(Array)
      #10 \wp-includes\class-wp.php(418): do_action_ref_array(‘parse_request’, Array)
      #11 \wp-includes\class-wp.php(813): WP->parse_request(”)
      #12 \wp-includes\functions.php(1336): WP->main(”)
      #13 \wp-blog-header.php(16): wp()
      #14 \index.php(17): require(‘C:\\laragon\\www\\…’)
      #15 {main}
      thrown”,
    • “file”: “\wp-content\plugins\create-block-theme\admin\create-theme\theme-fonts.php”,
    • “line”: 117
  • }
• },
• “additional_errors”: []

I’m not sure if this is something I can fix, so I thought I would report it here.

The fonts I have loaded are:

• Roboto (8 variants)
• Roboto Slab (4 variants)
• System sans-serif (1 variant)
• System serif (1 variant)

Other plugins loaded:

• Advanced custom fields pro
• SVG Block
• Git Updater