レポートのログで Exception Occurred が表示されます。

お世話になっております。

管理画面のレポートのログにて、下記の表示が頻繁に出ています。

Exception Occurred: /home/XXX/XXXXXXXX.com/public_html/concrete/vendor/tedivm/stash/src/Stash/Pool.php:115 Invalid or Empty Node passed to getItem constructor. (0)

これはログに表示されるだけで、特に支障はないのですが、
どういう現象で、どのようにすれば解消できるのかご存知であれば教えて頂けると助かります。どうぞよろしくお願いします。

【開発環境】

# concrete5 Version
Core Version - 8.5.5
Version Installed - 8.5.5
Database Version - 20201116182100

# Database Information
Version: 5.5.68-MariaDB
SQL Mode:

# concrete5 Packages
Block Designer (3.3.0), ExchangeCore reCAPTCHA (1.1.1), Open Graph Tags Lite (2.1.4), Simple Gallery (1.0.0), Social Share Lite (2.1.3)

# concrete5 Overrides
blocks/en_time/add.php, blocks/en_time/composer.php, blocks/en_time/config.json, blocks/en_time/controller.php, blocks/en_time/db.xml, blocks/en_time/edit.php, blocks/en_time/form.php, blocks/en_time/icon.png, blocks/en_time/view.js, blocks/en_time/view.php, blocks/en_time, blocks/external_form/form/controller/en01_form.php, blocks/external_form/form/controller/en03_form.php, blocks/external_form/form/controller/en_form.php, blocks/external_form/form/controller/jp01_form.php, blocks/external_form/form/controller/jp02_form.php, blocks/external_form/form/controller/jp03_form.php, blocks/external_form/form/controller/jp_form.php, blocks/external_form/form/controller/ka01_form.php, blocks/external_form/form/controller/shiba_form.php, blocks/external_form/form/controller, blocks/external_form/form/@jp_form.php, blocks/external_form/form/en01_form.php, blocks/external_form/form/en03_form.php, blocks/external_form/form/en_form.php, blocks/external_form/form/jp01_form.php, blocks/external_form/form/jp02_form.php, blocks/external_form/form/jp03_form.php, blocks/external_form/form/jp_form.php, blocks/external_form/form/ka01_form.php, blocks/external_form/form/shiba_form.php, blocks/external_form/form/test_1117.php, blocks/external_form/form, blocks/external_form, blocks/image_slider/templates/bukken.php, blocks/image_slider/templates, blocks/image_slider, blocks/jp_time/add.php, blocks/jp_time/composer.php, blocks/jp_time/config.json, blocks/jp_time/controller.php, blocks/jp_time/db.xml, blocks/jp_time/edit.php, blocks/jp_time/form.php, blocks/jp_time/icon.png, blocks/jp_time/view.js, blocks/jp_time/view.php, blocks/jp_time, blocks/lp_data/add.php, blocks/lp_data/composer.php, blocks/lp_data/config.json, blocks/lp_data/controller.php, blocks/lp_data/db.xml, blocks/lp_data/edit.php, blocks/lp_data/form.php, blocks/lp_data/icon.png, blocks/lp_data/view.php, blocks/lp_data, blocks/lp_data_list/add.php, blocks/lp_data_list/composer.php, blocks/lp_data_list/config.json, blocks/lp_data_list/controller.php, blocks/lp_data_list/db.xml, blocks/lp_data_list/edit.php, blocks/lp_data_list/form.php, blocks/lp_data_list/icon.png, blocks/lp_data_list/view.php, blocks/lp_data_list, blocks/lp_faq/add.php, blocks/lp_faq/composer.php, blocks/lp_faq/config.json, blocks/lp_faq/controller.php, blocks/lp_faq/db.xml, blocks/lp_faq/edit.php, blocks/lp_faq/form.php, blocks/lp_faq/icon.png, blocks/lp_faq/view.php, blocks/lp_faq, blocks/lp_first_section/add.php, blocks/lp_first_section/composer.php, blocks/lp_first_section/config.json, blocks/lp_first_section/controller.php, blocks/lp_first_section/db.xml, blocks/lp_first_section/edit.php, blocks/lp_first_section/form.php, blocks/lp_first_section/icon.png, blocks/lp_first_section/view.php, blocks/lp_first_section, blocks/lp_point/add.php, blocks/lp_point/composer.php, blocks/lp_point/config.json, blocks/lp_point/controller.php, blocks/lp_point/db.xml, blocks/lp_point/edit.php, blocks/lp_point/form.php, blocks/lp_point/icon.png, blocks/lp_point/view.php, blocks/lp_point, blocks/lp_spoint/add.php, blocks/lp_spoint/composer.php, blocks/lp_spoint/config.json, blocks/lp_spoint/controller.php, blocks/lp_spoint/db.xml, blocks/lp_spoint/edit.php, blocks/lp_spoint/form.php, blocks/lp_spoint/icon.png, blocks/lp_spoint/view.php, blocks/lp_spoint, blocks/page_list/templates/room_national/view.css, blocks/page_list/templates/room_national/view.php, blocks/page_list/templates/room_national, blocks/page_list/templates/room_serach/view.css, blocks/page_list/templates/room_serach/view.js, blocks/page_list/templates/room_serach/view.php, blocks/page_list/templates/room_serach, blocks/page_list/templates/room_serach2/view.css, blocks/page_list/templates/room_serach2/view.js, blocks/page_list/templates/room_serach2/view.php, blocks/page_list/templates/room_serach2, blocks/page_list/templates/room_serach2_en/view.css, blocks/page_list/templates/room_serach2_en/view.js, blocks/page_list/templates/room_serach2_en/view.php, blocks/page_list/templates/room_serach2_en, blocks/page_list/templates/room_serach_en/view.css, blocks/page_list/templates/room_serach_en/view.js, blocks/page_list/templates/room_serach_en/view.php, blocks/page_list/templates/room_serach_en, blocks/page_list/templates/_room-popup3.php, blocks/page_list/templates/_room-popup3e.php, blocks/page_list/templates/bukken-block-home-en.php, blocks/page_list/templates/bukken-block-home.php, blocks/page_list/templates/bukken-block.php, blocks/page_list/templates/bukken-block2-list.php, blocks/page_list/templates/bukken-block2.php, blocks/page_list/templates/bukken-block2e.php, blocks/page_list/templates/bukken-domitory-en.php, blocks/page_list/templates/bukken-house-en.php, blocks/page_list/templates/bukken-oneroom-en.php, blocks/page_list/templates/bukken-share-en.php, blocks/page_list/templates/bukken-type-domitory.php, blocks/page_list/templates/bukken-type-house.php, blocks/page_list/templates/bukken-type-oneroom.php, blocks/page_list/templates/bukken-type-share.php, blocks/page_list/templates/bukken-type1.php, blocks/page_list/templates/info-list.php, blocks/page_list/templates/review-list.php, blocks/page_list/templates/room-block2.php, blocks/page_list/templates/room-block3.php, blocks/page_list/templates/room-popup2.php, blocks/page_list/templates/room-popup3.php, blocks/page_list/templates/room-popup3e.php, blocks/page_list/templates/room-serach-sort.php, blocks/page_list/templates/room-serach4-en.php, blocks/page_list/templates/room-serach4.php, blocks/page_list/templates, blocks/page_list, blocks/page_title/templates/lp-h2.php, blocks/page_title/templates, blocks/page_title, blocks/search/templates/@tag_search3.php, blocks/search/templates/tag_search.php, blocks/search/templates/tag_search2.php, blocks/search/templates/tag_search3-en.php, blocks/search/templates/tag_search3.php, blocks/search/templates, blocks/search, blocks/simple_gallery/js_files/magnific-popup.js, blocks/simple_gallery/js_files, blocks/simple_gallery, blocks/social_share_lite/view.css, blocks/social_share_lite/view.php, blocks/social_share_lite, blocks/switch_language/templates/stucco.php, blocks/switch_language/templates, blocks/switch_language, blocks/topic_list/templates/flat_filter2.php, blocks/topic_list/templates, blocks/topic_list, blocks/two_blocks/add.php, blocks/two_blocks/composer.php, blocks/two_blocks/config.json, blocks/two_blocks/controller.php, blocks/two_blocks/db.xml, blocks/two_blocks/edit.php, blocks/two_blocks/form.php, blocks/two_blocks/icon.png, blocks/two_blocks/view.php, blocks/two_blocks, attributes/select/controller.php, attributes/select, mail/thanks03_en.php, mail/thanks03_jp.php, mail/thanks_en.php, mail/thanks_jp.php, mail/thanksmail.php, mail/thanksmail_ka01.php, themes/base/images/top, themes/base/images/favicon.ico, themes/base/images, themes/base/js/app.min.js, themes/base/js, themes/base/blank.php, themes/base/bukken_page.php, themes/base/bukken_page_en.php, themes/base/default.php, themes/base/description.txt, themes/base/home.php, themes/base/home_en.php, themes/base/lp_page.php, themes/base/page_not_found.php, themes/base/page_sample.php, themes/base/page_theme.php, themes/base/pagelist_page.php, themes/base/review_page.php, themes/base/right_sidebar.php, themes/base/search_page.php, themes/base/search_page_en.php, themes/base/thumbnail.png, themes/base/view.php, themes/base

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - Off
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
7.3.25

# PHP Extensions
apcu, bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imagick, imap, intl, json, ldap, libxml, mbstring, mcrypt, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, pspell, Reflection, session, shmop, SimpleXML, soap, sockets, SPL, sqlite3, standard, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend OPcache, zip, zlib

# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 500M
post_max_size - 30M
upload_max_filesize - 30M
ldap.max_links - Unlimited
mbstring.regex_stack_limit - 100000
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - no value
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
opcache.max_accelerated_files - 10000
opcache.max_file_size - 0
opcache.max_wasted_percentage - 5