Fatal error in safe-svg/includes/blocks.php:51 when accessing the Wordpress Customizer

[cguidog]

Describe the bug

Wordpress returns a fatal error when trying to access the Customizer while having the SafeSVG plugin active.

Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in safe-svg/includes/blocks.php:51

Steps to Reproduce

1. Make sure the SafeSVG plugin is active.
2. Go to Appearance -> Customize.
3. Wordpress return Fatal error (see issue description).
4. Go to Plugins and deactivate SafeSVG plugin.
5. Go to Appearance -> Customize.
6. Customizer page loads and works as expected.

Screenshots, screen recording, code snippet

No response

Environment information

No response

WordPress information

`

wp-core

version: 6.5.3
site_language: en_US
user_language: en_US
timezone: America/New_York
permalink: /blog/%postname%/
https_status: true
multisite: false
user_registration: 0
blog_public: 0
default_comment_status: undefined
environment_type: local
user_count: 1
dotorg_communication: true

wp-paths-sizes

wordpress_path: /Users/admin/Local Sites/my_website/app/public
wordpress_size: 57.38 MB (60165411 bytes)
uploads_path: /Users/admin/Local Sites/my_website/app/public/wp-content/uploads
uploads_size: 7.98 MB (8368168 bytes)
themes_path: /Users/admin/Local Sites/my_website/app/public/wp-content/themes
themes_size: 151.79 MB (159160789 bytes)
plugins_path: /Users/admin/Local Sites/my_website/app/public/wp-content/plugins
plugins_size: 64.06 MB (67169499 bytes)
database_size: 25.64 MB (26886144 bytes)
total_size: 306.84 MB (321750011 bytes)

wp-active-theme

name: my_custom_theme (my_custom_theme)
version: 1.2.0
author: my_custom_theme Data
author_website: https://my_custom_theme.com
parent_theme: Understrap (understrap)
theme_features: core-block-patterns, widgets-block-editor, editor-color-palette, disable-custom-colors, automatic-feed-links, title-tag, menus, html5, post-thumbnails, customize-selective-refresh-widgets, post-formats, custom-background, custom-logo, responsive-embeds, editor-styles, align-wide, widgets, editor-style
theme_path: /Users/admin/Local Sites/my_website/app/public/wp-content/themes/my_custom_theme
auto_update: Disabled

wp-parent-theme

name: Understrap (understrap)
version: 1.2.4
author: Howard Development & Consulting
author_website: https://howarddc.com
theme_path: /Users/admin/Local Sites/my_website/app/public/wp-content/themes/understrap
auto_update: Disabled

wp-mu-plugins (1)

Local WP Live Link Helper: version: 2.0, author: Flywheel

wp-plugins-active (6)

Advanced Custom Fields PRO: version: 6.2.9, author: WP Engine, Auto-updates disabled
Complianz | GDPR/CCPA Cookie Consent: version: 7.0.5, author: Really Simple Plugins, Auto-updates disabled
my_custom_theme Migrate: version: 1.0, author: Your Name, Auto-updates disabled
PublishPress Authors: version: 4.4.1, author: PublishPress, Auto-updates disabled
Rank Math SEO with AI Best SEO Tools: version: 1.0.218, author: Rank Math, Auto-updates disabled
Weglot Translate: version: 4.2.6, author: Weglot Translate team, Auto-updates disabled

wp-plugins-inactive (1)

Safe SVG: version: 2.2.4, author: 10up, Auto-updates disabled

wp-media

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1808
imagemagick_version: ImageMagick 7.1.0-46 Q16 aarch64 5ef3d4d66:20220816 https://imagemagick.org
imagick_version: 3.7.0
file_uploads: 1
post_max_size: 1000M
upload_max_filesize: 300M
max_effective_size: 300 MB
max_file_uploads: 20
imagick_limits:
imagick::RESOURCETYPE_AREA: 32 GB
imagick::RESOURCETYPE_DISK: 9.2233720368548E+18
imagick::RESOURCETYPE_FILE: 7872
imagick::RESOURCETYPE_MAP: 32 GB
imagick::RESOURCETYPE_MEMORY: 16 GB
imagick::RESOURCETYPE_THREAD: 1
imagick::RESOURCETYPE_TIME: 9.2233720368548E+18
imagemagick_file_formats: 3FR, 3G2, 3GP, AAI, AI, APNG, ART, ARW, ASHLAR, AVI, AVS, BAYER, BAYERA, BGR, BGRA, BGRO, BMP, BMP2, BMP3, BRF, CAL, CALS, CANVAS, CAPTION, CIN, CIP, CLIP, CMYK, CMYKA, CR2, CR3, CRW, CUBE, CUR, CUT, DATA, DCM, DCR, DCRAW, DCX, DDS, DFONT, DNG, DOT, DPX, DXT1, DXT5, EPDF, EPI, EPS, EPS2, EPS3, EPSF, EPSI, EPT, EPT2, EPT3, ERF, EXR, FARBFELD, FAX, FF, FILE, FITS, FL32, FLV, FRACTAL, FTP, FTS, FTXT, G3, G4, GIF, GIF87, GRADIENT, GRAY, GRAYA, GROUP4, GV, HALD, HDR, HISTOGRAM, HRZ, HTM, HTML, HTTP, HTTPS, ICB, ICO, ICON, IIQ, INFO, INLINE, IPL, ISOBRL, ISOBRL6, JNG, JNX, JPE, JPEG, JPG, JPS, JSON, K25, KDC, KERNEL, LABEL, M2V, M4V, MAC, MAP, MASK, MAT, MATTE, MEF, MIFF, MKV, MNG, MONO, MOV, MP4, MPC, MPEG, MPG, MRW, MSL, MSVG, MTV, MVG, NEF, NRW, NULL, ORA, ORF, OTB, OTF, PAL, PALM, PAM, PANGO, PATTERN, PBM, PCD, PCDS, PCL, PCT, PCX, PDB, PDF, PDFA, PEF, PES, PFA, PFB, PFM, PGM, PGX, PHM, PICON, PICT, PIX, PJPEG, PLASMA, PNG, PNG00, PNG24, PNG32, PNG48, PNG64, PNG8, PNM, POCKETMOD, PPM, PS, PS2, PS3, PSB, PSD, PTIF, PWP, QOI, RADIAL-GRADIENT, RAF, RAS, RAW, RGB, RGB565, RGBA, RGBO, RGF, RLA, RLE, RMF, RW2, SCR, SCT, SFW, SGI, SHTML, SIX, SIXEL, SPARSE-COLOR, SR2, SRF, STEGANO, STRIMG, SUN, SVG, SVGZ, TEXT, TGA, THUMBNAIL, TIFF, TIFF64, TILE, TIM, TM2, TTC, TTF, TXT, UBRL, UBRL6, UIL, UYVY, VDA, VICAR, VID, VIFF, VIPS, VST, WBMP, WEBM, WEBP, WMV, WPG, X3F, XBM, XC, XCF, XPM, XPS, XV, YAML, YCbCr, YCbCrA, YUV
gd_version: bundled (2.1.0 compatible)
gd_formats: GIF, JPEG, PNG, WebP, BMP
ghostscript_version: 9.56.1

wp-server

server_architecture: Darwin 23.4.0 arm64
httpd_software: nginx/1.16.0
php_version: 8.1.23 64bit
php_sapi: fpm-fcgi
max_input_variables: 4000
time_limit: 1200
memory_limit: 256M
max_input_time: 600
upload_max_filesize: 300M
php_post_max_size: 1000M
curl_version: 8.4.0 (SecureTransport) LibreSSL/3.3.6
suhosin: false
imagick_availability: true
pretty_permalinks: true
htaccess_extra_rules: false
current: 2024-05-10T13:06:37+00:00
utc-time: Friday, 10-May-24 13:06:37 UTC
server-time: 2024-05-10T09:06:36-04:00

wp-database

extension: mysqli
server_version: 8.0.16
client_version: mysqlnd 8.1.23
max_allowed_packet: 16777216
max_connections: 151

wp-constants

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /Users/admin/Local Sites/my_website/app/public/wp-content
WP_PLUGIN_DIR: /Users/admin/Local Sites/my_website/app/public/wp-content/plugins
WP_MEMORY_LIMIT: 40M
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_ENVIRONMENT_TYPE: local
WP_DEVELOPMENT_MODE: undefined
DB_CHARSET: utf8
DB_COLLATE: undefined

wp-filesystem

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable
mu-plugins: writable

publishpress-modules (11)

modules_settings: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/modules_settings]
author_boxes: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/author_boxes]
author_categories: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/author_categories]
author_custom_fields: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/author_custom_fields]
settings: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/settings]
multiple_authors: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/multiple_authors]
default_layouts: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/default_layouts]
rest_api: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/rest_api]
polylang_integration: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/polylang_integration]
reviews: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/reviews]
rank_math_seo_integration: on [/Users/admin/Local Sites/my_website/app/public/wp-content/plugins/publishpress-authors/src/modules//modules/rank_math_seo_integration]

`

Code of Conduct

• I agree to follow this project's Code of Conduct

[kmgalanakis]

Hello @cguidog

In the PHP file where the PHP fatal error is thrown, the plugin attempts to insert a new block category into the existing list of block categories. The WordPress hook (block_categories_all) that allows that is assuming that the filtered value (array of block categories) will always be an array.

For some reason, in your site, this value is eventually filtered to null, most probably because of some third-party plugin or theme. In #200 I'm attempting a fix for that by assuring that the filtered value will always be an array.

Thank you

[dkotter]

@cguidog Following on from the above ^ I also couldn't reproduce the problem though the PR we have up looks like it will fix things. If you have a second to test that PR and let us know if it addresses your issues, that would be great. Thanks!