PHP Warning: Undefined array key 0 in memcached-object-cache.php

Dear Powered Cache Team

It’s me again ??

I found the following PHP warning on the Reviews tab of a site running WooCommerce. The warning is visible on versions PHP 8.0, PHP 8.1 and PHP 8.2:

Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 0 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472 Warning: Undefined array key 1 in /usr/www/users/username/domain.co.za/wp-content/plugins/powered-cache/includes/dropins/memcached-object-cache.php on line 472

Go to the link below to see a screenshot of the warning on the frontend of the site:
https://tinyurl.com/2grfug55

In case you need it, here is the site info:

wp-core

version: 6.2.2
site_language: en_ZA
user_language: en_ZA
timezone: Africa/Johannesburg
permalink: /%postname%/
https_status: true
multisite: false
user_registration: 0
blog_public: 1
default_comment_status: undefined
environment_type: production
user_count: 133
dotorg_communication: true

wp-paths-sizes

wordpress_path: /usr/www/users/username/domain.co.za
wordpress_size: 65.23 MB (68394780 bytes)
uploads_path: /usr/www/users/username/domain.co.za/wp-content/uploads
uploads_size: 17.03 MB (17861654 bytes)
themes_path: /usr/www/users/username/domain.co.za/wp-content/themes
themes_size: 6.78 MB (7110862 bytes)
plugins_path: /usr/www/users/username/domain.co.za/wp-content/plugins
plugins_size: 99.17 MB (103984061 bytes)
database_size: 28.81 MB (30212096 bytes)
total_size: 217.02 MB (227563453 bytes)

wp-dropins (2)

advanced-cache.php: true
object-cache.php: true

wp-active-theme

name:
version: 1.0.0
author: Tigme
author_website: https://tigme.com/
parent_theme: Vantage (vantage)
theme_features: core-block-patterns, post-thumbnails, automatic-feed-links, siteorigin-panels, menus, post-formats, woocommerce, wc-product-gallery-zoom, wc-product-gallery-lightbox, wc-product-gallery-slider, custom-logo, title-tag, align-wide, infinite-scroll, siteorigin-template-settings, siteorigin-premium-no-attribution, siteorigin-premium-ajax-comments, siteorigin-premium-logo-booster, custom-background, widgets, editor-style
theme_path: /usr/www/users/username/domain.co.za/wp-content/themes/
auto_update: Disabled

wp-parent-theme

name: Vantage (vantage)
version: 1.20.11
author: SiteOrigin
author_website: https://siteorigin.com/
theme_path: /usr/www/users/username/domain.co.za/wp-content/themes/vantage
auto_update: Disabled

wp-themes-inactive (1)

Twenty Twenty-Three: version: 1.1, author: the WordPress team, Auto-updates enabled

wp-plugins-active (15)

Classic Editor: version: 1.6.3, author: WordPress Contributors, Auto-updates disabled
CookieYes | GDPR Cookie Consent: version: 3.0.9, author: CookieYes, Auto-updates disabled
Customer Reviews for WooCommerce: version: 5.27.2, author: CusRev, Auto-updates disabled
Custom Product Tabs for WooCommerce: version: 1.8.2, author: YIKES, Inc., Auto-updates disabled
MC4WP: Mailchimp for WordPress: version: 4.9.4, author: ibericode, Auto-updates disabled
Meow Analytics: version: 1.2.0, author: Jordy Meow, Auto-updates disabled
Page Builder by SiteOrigin: version: 2.23.0, author: SiteOrigin, Auto-updates disabled
Popup Maker: version: 1.18.1, author: Popup Maker, Auto-updates disabled
Powered Cache: version: 3.0.4, author: Powered Cache, Auto-updates disabled
Redirection: version: 5.3.10, author: John Godley, Auto-updates disabled
SiteOrigin Widgets Bundle: version: 1.50.0, author: SiteOrigin, Auto-updates disabled
The SEO Framework: version: 4.2.8, author: The SEO Framework Team, Auto-updates disabled
WooCommerce: version: 7.7.0, author: Automattic, Auto-updates disabled
WooCommerce Payfast Gateway: version: 1.5.3, author: WooCommerce, Auto-updates disabled
Wordfence Security: version: 7.9.2, author: Wordfence, Auto-updates disabled

wp-media

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1690
imagemagick_version: ImageMagick 6.9.10-23 Q16 x86_64 20190101 https://imagemagick.org
imagick_version: 3.7.0
file_uploads: File uploads is turned off
post_max_size: 32M
upload_max_filesize: 32M
max_effective_size: 32 MB
max_file_uploads: 20
imagick_limits:
imagick::RESOURCETYPE_AREA: 122 MB
imagick::RESOURCETYPE_DISK: 1073741824
imagick::RESOURCETYPE_FILE: 3072
imagick::RESOURCETYPE_MAP: 512 MB
imagick::RESOURCETYPE_MEMORY: 256 MB
imagick::RESOURCETYPE_THREAD: 1
imagick::RESOURCETYPE_TIME: 1.844674407371E+19
imagemagick_file_formats: 3FR, 3G2, 3GP, AAI, AI, ART, ARW, AVI, AVS, BGR, BGRA, BGRO, BIE, BMP, BMP2, BMP3, BRF, CAL, CALS, CANVAS, CAPTION, CIN, CIP, CLIP, CMYK, CMYKA, CR2, CRW, CUR, CUT, DATA, DCM, DCR, DCX, DDS, DFONT, DJVU, DNG, DOT, DPX, DXT1, DXT5, EPDF, EPI, EPS, EPS2, EPS3, EPSF, EPSI, EPT, EPT2, EPT3, ERF, EXR, FAX, FILE, FITS, FRACTAL, FTP, FTS, G3, G4, GIF, GIF87, GRADIENT, GRAY, GRAYA, GROUP4, GV, H, HALD, HDR, HEIC, HISTOGRAM, HRZ, HTM, HTML, HTTP, HTTPS, ICB, ICO, ICON, IIQ, INFO, INLINE, IPL, ISOBRL, ISOBRL6, J2C, J2K, JBG, JBIG, JNG, JNX, JP2, JPC, JPE, JPEG, JPG, JPM, JPS, JPT, JSON, K25, KDC, LABEL, M2V, M4V, MAC, MAGICK, MAP, MASK, MAT, MATTE, MEF, MIFF, MKV, MNG, MONO, MOV, MP4, MPC, MPEG, MPG, MRW, MSL, MSVG, MTV, MVG, NEF, NRW, NULL, ORF, OTB, OTF, PAL, PALM, PAM, PANGO, PATTERN, PBM, PCD, PCDS, PCL, PCT, PCX, PDB, PDF, PDFA, PEF, PES, PFA, PFB, PFM, PGM, PGX, PICON, PICT, PIX, PJPEG, PLASMA, PNG, PNG00, PNG24, PNG32, PNG48, PNG64, PNG8, PNM, PPM, PREVIEW, PS, PS2, PS3, PSB, PSD, PTIF, PWP, RADIAL-GRADIENT, RAF, RAS, RAW, RGB, RGBA, RGBO, RGF, RLA, RLE, RMF, RW2, SCR, SCT, SFW, SGI, SHTML, SIX, SIXEL, SPARSE-COLOR, SR2, SRF, STEGANO, SUN, SVG, SVGZ, TEXT, TGA, THUMBNAIL, TIFF, TIFF64, TILE, TIM, TTC, TTF, TXT, UBRL, UBRL6, UIL, UYVY, VDA, VICAR, VID, VIFF, VIPS, VST, WBMP, WEBP, WMF, WMV, WMZ, WPG, X, X3F, XBM, XC, XCF, XPM, XPS, XV, XWD, YCbCr, YCbCrA, YUV
gd_version: 2.3.3
gd_formats: GIF, JPEG, PNG, WebP, BMP, AVIF, XPM
ghostscript_version: 9.27

wp-server

server_architecture: Linux 4.19.0-24-amd64 x86_64
httpd_software: Apache
php_version: 8.1.18 64bit
php_sapi: fpm-fcgi
max_input_variables: 3500
time_limit: 90
memory_limit: 256M
max_input_time: 60
upload_max_filesize: 32M
php_post_max_size: 32M
curl_version: 7.64.0 OpenSSL/1.1.1n
suhosin: false
imagick_availability: true
pretty_permalinks: true
htaccess_extra_rules: true

wp-database

extension: mysqli
server_version: 10.4.29-MariaDB-1:10.4.29+maria~deb10
client_version: mysqlnd 8.1.18
max_allowed_packet: 16777216
max_connections: 151

wp-constants

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /usr/www/users/username/domain.co.za/wp-content
WP_PLUGIN_DIR: /usr/www/users/username/domain.co.za/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: true
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_ENVIRONMENT_TYPE: Undefined
DB_CHARSET: utf8mb4
DB_COLLATE: undefined

wp-filesystem

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

Kind regards.