{"id":18984910,"date":"2026-08-05T15:41:49","date_gmt":"2026-08-05T15:41:49","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/wordpress-database-error-210\/"},"modified":"2026-08-05T15:41:49","modified_gmt":"2026-08-05T15:41:49","slug":"wordpress-database-error-210","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/wordpress-database-error-210\/","title":{"rendered":"WordPress database error"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">After updating to version 2.4.9, the debug.log file shows hundreds of errors of the same type:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#091;05-Aug-2026 15:35:15 UTC] WordPress database error Duplicate entry '' for key 'wp_blc_links.url_hash' for query ALTER TABLE <code>wp_blc_links<\/code> ADD UNIQUE KEY <code>url_hash<\/code> (<code>url_hash<\/code>) made by require('wp-blog-header.php'), require_once('wp-load.php'), require_once('wp-config.php'), require_once('wp-settings.php'), do_action('init'), WP_Hook-&gt;do_action, WP_Hook-&gt;apply_filters, blc_init, blcDatabaseUpgrader::upgrade_database, blcDatabaseUpgrader::make_schema_current, blcTableDelta::delta<br \/><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">I\u2019m going to revert to the previous version because the debug.log file is getting far too big.<\/p>\n","protected":false},"template":"","class_list":["post-18984910","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18984910","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/18984910\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=18984910"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}