• Resolved ucsendre

    (@ucsendre)


    Hello,
    Thanks for this really useful plugin.
    I have just found it and it seems to be the best for my needs about this EU legal requirement.
    It works all fine in most cases, but for one product it just stopped working and gave the below error message.
    The error does not happen at another products and only apperars if the _eggl_show_garan option is active. I am using the [eu_garan] shortcode as I have custom product page layout.

    PHP Fatal error: substr(): Cannot use output buffering in output buffering display handlers in /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/html-api/class-wp-html-tag-processor.php on line 2644
    Stack trace: 0 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/html-api/class-wp-html-tag-processor.php(4933): WP_HTML_Tag_Processor->apply_attributes_updates() 1 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/html-api/class-wp-html-tag-processor.php(2746): WP_HTML_Tag_Processor->get_updated_html() 2 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/script-loader.php(4034): WP_HTML_Tag_Processor->seek() 3 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/class-wp-hook.php(355): {closure:wp_hoist_late_printed_styles():3859}() 4 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/plugin.php(206): WP_Hook->apply_filters() 5 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/template.php(1085): apply_filters() 6 [internal function]: wp_finalize_template_enhancement_output_buffer() 7 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/functions.php(5581): ob_end_flush() 8 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/class-wp-hook.php(353): wp_ob_end_flush_all() 9 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters() 10 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/plugin.php(523): WP_Hook->do_action() 11 /var/www/vhosts/mydomain.tld/staging.mydomain.tld/wp-includes/load.php(1308): do_action() 12 [internal function]: shutdown_action_hook() 13 {main}

    The [eu_guarantee_notice] shortcode works fine on all product pages, even on that one, where the [eu_garan] gives the fatal error when activated.

    Please help me find out how this error can be fixed as I would really like to use your nice plugin.

    See my WP environment below:

    WordPress Environment<br><br>WordPress address (URL): https://staging.mydomain.tld<br>Site address (URL): https://staging.mydomain.tld<br>WC Version: 11.1.2<br>Action Scheduler Version: ✔ 4.0.0<br>Log Directory Writable: ✔<br>WP Version: 7.1.2<br>WP Multisite: –<br>WP Memory Limit: 256 MB<br>WP Debug Mode: ✔<br>WP Cron: ✔<br>WP Environment Type: production<br>Language: hu_HU<br>External object cache: – Server Environment<br><br>Server Info: nginx/1.30.4<br>Server Architecture: Linux 6.1.0-52-amd64 x86_64<br>PHP Version: 8.5.11<br>PHP Post Max Size: 90 MB<br>PHP Time Limit: 900<br>PHP Max Input Vars: 1000<br>cURL Version: 7.88.1<br>OpenSSL/3.0.22<br><br>SUHOSIN Installed: –<br>MySQL Version: 11.4.13-MariaDB-deb12<br>Max Upload Size: 80 MB<br>Default Timezone is UTC: ✔<br>fsockopen/cURL: ✔<br>SoapClient: ✔<br>DOMDocument: ✔<br>GZip: ✔<br>Multibyte String: ✔<br>Remote Post: ✔<br>Remote Get: ✔ Database<br><br>WC Database Version: 11.1.2<br>WC Database Prefix: S5B8DO0y_<br>Teljes 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+ Index: 0.02MB + Engine InnoDB<br>S5B8DO0y_relevanssi: Adat: 6.48MB + Index: 10.53MB + Engine InnoDB<br>S5B8DO0y_relevanssi_log: Adat: 0.02MB + Index: 0.03MB + Engine InnoDB<br>S5B8DO0y_relevanssi_stopwords: Adat: 0.02MB + Index: 0.00MB + Engine InnoDB<br>S5B8DO0y_social_users: Adat: 0.02MB + Index: 0.03MB + Engine InnoDB<br>S5B8DO0y_termmeta: Adat: 0.06MB + Index: 0.03MB + Engine InnoDB<br>S5B8DO0y_terms: Adat: 0.05MB + Index: 0.03MB + Engine InnoDB<br>S5B8DO0y_term_relationships: Adat: 0.17MB + Index: 0.08MB + Engine InnoDB<br>S5B8DO0y_term_taxonomy: Adat: 0.05MB + Index: 0.03MB + Engine InnoDB<br>S5B8DO0y_trustindex_arukereso_reviews: Adat: 0.02MB + Index: 0.00MB + Engine InnoDB<br>S5B8DO0y_trustindex_arukereso_views: Adat: 0.02MB + Index: 0.00MB + Engine InnoDB<br>S5B8DO0y_usermeta: Adat: 0.14MB + Index: 0.14MB + Engine InnoDB<br>S5B8DO0y_users: Adat: 0.02MB + Index: 0.05MB + Engine InnoDB<br>S5B8DO0y_visszakuldes_kerelmek: Adat: 0.02MB + Index: 0.00MB + Engine 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+ Engine InnoDB<br>S5B8DO0y_wc_order_product_lookup: Adat: 0.05MB + Index: 0.08MB + Engine InnoDB<br>S5B8DO0y_wc_order_stats: Adat: 0.02MB + Index: 0.06MB + Engine InnoDB<br>S5B8DO0y_wc_order_tax_lookup: Adat: 0.02MB + Index: 0.03MB + Engine InnoDB<br>S5B8DO0y_wc_product_attributes_lookup: Adat: 0.13MB + Index: 0.31MB + Engine InnoDB<br>S5B8DO0y_wc_product_download_directories: Adat: 0.02MB + Index: 0.02MB + Engine InnoDB<br>S5B8DO0y_wc_product_meta_lookup: Adat: 0.06MB + Index: 0.11MB + Engine InnoDB<br>S5B8DO0y_wc_rate_limits: Adat: 0.02MB + Index: 0.02MB + Engine InnoDB<br>S5B8DO0y_wc_reserved_stock: Adat: 0.02MB + Index: 0.02MB + Engine InnoDB<br>S5B8DO0y_wc_tax_rate_classes: Adat: 0.02MB + Index: 0.02MB + Engine InnoDB<br>S5B8DO0y_wc_webhooks: Adat: 0.02MB + Index: 0.02MB + Engine InnoDB<br>S5B8DO0y_woocommerce_bundled_itemmeta: Adat: 0.13MB + Index: 0.20MB + Engine InnoDB<br>S5B8DO0y_woocommerce_bundled_items: Adat: 0.02MB + Index: 0.03MB + Engine 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1<br>wpcf7_contact_form: 9 Security<br><br>Secure connection (HTTPS): ✔<br>Hide errors from visitors: ✔ Active Plugins (35)<br><br>Akismet Anti-Spam: Spamvédelem: írta Automattic - Anti Spam Team – 5.7.2<br>BVF Business Admin: írta BVF – 3.3.3<br>BVF WooCommerce Cart Links: írta BVF – 1.0.0<br>Klasszikus szerkesztő: írta WordPress-közreműködők – 1.7.0<br>Conditional Payments for WooCommerce: írta Lauri Karisola / WP Trio – 3.5.1<br>Contact Form 7: írta Rock Lobster Inc. – 6.1.7<br>Coupon by User Role for WooCommerce Pro: írta WPFactory – 2.2.2<br>Custom Payment Gateways for WooCommerce: írta Imaginate Solutions – 2.2.0<br>Duplicate Page: írta mndpsingh287 – 4.5.9<br>Envato Market: írta Envato – 2.0.14<br>EU Legal-Guarantee Notice & GARAN Durability Label for WooCommerce: írta GARAN Labs – 1.9.4<br>GDPR Cookie Compliance: írta Moove Agency – 5.1.0<br>WooCommerce Csomagpontok és Címkék: írta Viszt Péter – 4.2.8<br>WooCommerce Számlázz.hu Integráció: írta Viszt Péter – 6.2.2<br>Loco 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#21 - /shop/aszf/ Theme<br><br>Name: padlofutes<br>Version: 2026.05<br>Author URL:<br>Child Theme: ✔<br>Parent Theme Name: Flatsome<br>Parent Theme Version: 3.20.11<br>Parent Theme Author URL: https://uxthemes.com<br>Theme type: Classic theme<br>WooCommerce Support: ✔ Templates<br><br>Override: wp-content/themes/flatsome/woocommerce/archive-product.php<br>Override: wp-content/themes/flatsome/woocommerce/cart/cart-empty.php<br>Override: wp-content/themes/flatsome/woocommerce/cart/cart-shipping.php<br>Override: wp-content/themes/flatsome/woocommerce/cart/cart.php<br>Override: wp-content/themes/flatsome/woocommerce/cart/mini-cart.php<br>Override: wp-content/themes/flatsome/woocommerce/checkout/form-checkout.php<br>Override: wp-content/themes/flatsome/woocommerce/checkout/form-coupon.php<br>Override: wp-content/themes/flatsome/woocommerce/checkout/order-received.php<br>Override: wp-content/themes/flatsome/woocommerce/checkout/terms.php<br>Override: wp-content/themes/flatsome/woocommerce/checkout/thankyou.php<br>Override: wp-content/themes/flatsome/woocommerce/content-product-cat.php<br>Override: wp-content/themes/flatsome/woocommerce/content-product.php<br>Override: wp-content/themes/flatsome/woocommerce/content-single-product.php<br>Override: wp-content/themes/flatsome/woocommerce/content-widget-product.php<br>Override: wp-content/themes/flatsome/woocommerce/global/breadcrumb.php<br>Override: wp-content/themes/flatsome/woocommerce/global/quantity-input.php<br>Override: wp-content/themes/flatsome/woocommerce/global/wrapper-end.php<br>Override: wp-content/themes/flatsome/woocommerce/global/wrapper-start.php<br>Override: wp-content/themes/flatsome/woocommerce/loop/header.php<br>Override: wp-content/themes/flatsome/woocommerce/loop/loop-end.php<br>Override: wp-content/themes/flatsome/woocommerce/loop/loop-start.php<br>Override: wp-content/themes/flatsome/woocommerce/loop/pagination.php<br>Override: wp-content/themes/flatsome/woocommerce/loop/rating.php<br>Override: wp-content/themes/flatsome/woocommerce/loop/result-count.php<br>Override: wp-content/themes/flatsome/woocommerce/loop/sale-flash.php<br>Override: wp-content/themes/padlofutes/woocommerce/myaccount/dashboard.php<br>Override: wp-content/themes/padlofutes/woocommerce/myaccount/form-edit-account.php<br>Override: wp-content/themes/flatsome/woocommerce/myaccount/form-login.php<br>Override: wp-content/themes/flatsome/woocommerce/myaccount/navigation.php<br>Override: wp-content/themes/flatsome/woocommerce/notices/error.php<br>Override: wp-content/themes/flatsome/woocommerce/notices/notice.php<br>Override: wp-content/themes/flatsome/woocommerce/notices/success.php<br>Override: wp-content/themes/flatsome/woocommerce/product-searchform.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/photoswipe.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/price.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/product-image.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/product-thumbnails.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/rating.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/related.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/review.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/sale-flash.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/share.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/short-description.php<br>Override: wp-content/themes/padlofutes/woocommerce/single-product/stock.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/tabs/tabs.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/title.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product/up-sells.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product-reviews.php<br>Override: wp-content/themes/flatsome/woocommerce/single-product.php<br>Override: wp-content/themes/flatsome/woocommerce/content-product-cat.php Product Visibility by User Role Settings<br><br>Product Visibility by User Role: yes<br>Hide catalog visibility: yes<br>Make non-purchasable: yes<br>Modify query: yes<br>Hide menu items: no<br>Hide product categories/tags: no<br>Redirect:<br>Enable Redirect URLs per product: no<br>Replace description: no<br>Content to replace with, e.g.: Log in to see the product description.:<br>Replace short description: no<br>Content to replace with, e.g.: Log in to see the product description.:<br>User roles to display in settings: Array<br>(<br>&#091;0] => guest<br>&#091;1] => customer<br>&#091;2] => nagyker<br>&#091;3] => kivitelezo<br>&#091;4] => kiemelt<br>&#091;5] => elite_customer<br>)<br>Admin products list column: yes<br>Product quick edit: yes<br>Products bulk edit: no<br>Bulk settings for role guest: not set<br>Enable/Disable:<br>Hide all:<br>Products:<br>Invisible:<br>Product categories:<br>Invisible:<br>Product tags:<br>Invisible:<br>Bulk settings for role customer: not set<br>Enable/Disable:<br>Hide all:<br>Products:<br>Invisible:<br>Product categories:<br>Invisible:<br>Product tags:<br>Invisible:<br>Bulk settings for role nagyker: not set<br>Enable/Disable:<br>Hide all:<br>Products:<br>Invisible:<br>Product categories:<br>Invisible:<br>Product tags:<br>Invisible:<br>Bulk settings for role kivitelezo: not set<br>Enable/Disable:<br>Hide all:<br>Products:<br>Invisible:<br>Product categories:<br>Invisible:<br>Product tags:<br>Invisible:<br>Bulk settings for role kiemelt: not set<br>Enable/Disable:<br>Hide all:<br>Products:<br>Invisible:<br>Product categories:<br>Invisible:<br>Product tags:<br>Invisible:<br>Bulk settings for role elite_customer: not set<br>Enable/Disable:<br>Hide all:<br>Products:<br>Invisible:<br>Product categories:<br>Invisible:<br>Product tags:<br>Invisible: Product Bundles<br><br>Database Version: 8.5.12<br>Loopback Test: ✔<br>Template Overrides: padlofutes/woocommerce/single-product/add-to-cart/bundle-add-to-cart-wrap.php Admin<br><br>Enabled Features: store-alerts<br>Disabled Features: experimental-blocks<br>minified-js<br>settings-ui<br>rest-api-v4<br>order-detail-redesign<br><br>Daily Cron: ✔ Next scheduled: 2026-09-29 08:54:58 +02:00<br>Options: ✔<br>Notes: 46<br>Onboarding: skipped Action Scheduler<br><br>Teljesítve: 3 854<br>Oldest: 2026-09-09 12:54:23 +0200<br>Newest: 2026-09-29 08:32:23 +0200<br><br>Sikertelen: 8<br>Oldest: 2026-09-17 10:59:15 +0200<br>Newest: 2026-09-25 04:28:03 +0200<br><br>Függőben: 25<br>Oldest: 2026-09-29 08:52:59 +0200<br>Newest: 2026-10-13 06:52:59 +0200 Status report information<br><br>Generated at: 2026-09-29 08:33:05 +02:00<br>

    Thanks and regards,
    Endre

Viewing 2 replies - 1 through 2 (of 2 total)
  • Plugin Author GaranLabs

    (@garanlabs)

    Hi @ucsendre

    Thank you for your kind words and for the detailed report. The environment details and stack trace were very helpful.

    What we found so far

    The error in the log (“Cannot use output buffering in output buffering display handlers”) is not the original error. Since version 6.9, WordPress processes the whole finished page at the end of each request. If another error happens during that step, PHP can’t display it and shows this message instead, so the underlying cause is hidden.

    Our main suspect is that the page is using more memory than the 256 MB limit. The full GARAN label is a fairly detailed graphic. On variable products the plugin currently includes a copy of it for every variation, so a product with many variations can make the page very large. That would explain why only this one product is affected, only when GARAN is enabled, while [eu_guarantee_notice] works fine on the same page.

    Could you help us confirm this?

    1. Is this a variable product? If so, roughly how many variations does it have?
    2. Could you temporarily raise the memory limit in wp-config.php and check whether the error goes away?
      define( ‘WP_MEMORY_LIMIT’, ‘512M’ );
      (If your host enforces a lower PHP memory_limit, this may need to be raised in the hosting panel as well.)
    3. If possible, open the product page’s source (Ctrl+U) and tell us roughly how many times “eggl-widget–garan” appears.
    Thread Starter ucsendre

    (@ucsendre)

    Hi @garanlabs

    Yes, this is a variable product with 35 variations.

    It seems like I have found a solution and now all products work fine.

    On your plugin’s settings page (/wp-admin/admin.php?page=eggl-guarantee-settings) the "eggl_garan_position" option was set to "under_image" and the GARAN banner image was added to the product gallery. I have changed this option to "after_add_to_cart" (which in my case did not change the position as I use the [eu_garan] shortcode in my custom product page layout) and now the GARAN image is not added to the product gallery and the error is gone.

    With the "after_add_to_cart" setting I have two "eggl-widget" divs: one "eggl-widget--garan" and one "eggl-widget--notice".

    If I set the "eggl_garan_position" to "under_image" the page of the product with 35 variations does not load at all, but another variable product with 25 variations works and it has 56 "eggl-widget" divs: 55 times "eggl-widget--garan" and one "eggl-widget--notice".

    I set this issue to resolved. Thanks for your response and again for the great plugin.

    Best regards,
    Endre

Viewing 2 replies - 1 through 2 (of 2 total)

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