Duplicate key value violates unique constraint "path_alias____pkey"


If you get an error that looks like this while saving a node or a taxonomy term in Drupal, it may mean that the table that stores path aliases in the database has become corrupted for some reason.

Drupal\Core\Entity\EntityStorageException: SQLSTATE[23505]: Unique violation: 7 
ERROR: duplicate key value violates unique constraint "path_alias____pkey" DETAIL: 
Key (id)=(30) already exists.: INSERT INTO "path_alias" ("revision_id", "uuid", 
"langcode", "path", "alias", "status") VALUES (:db_insert_placeholder_0, 
:db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, 
:db_insert_placeholder_4, :db_insert_placeholder_5) RETURNING id; Array ( ) in 
Drupal\Core\Entity\Sql\SqlContentEntityStorage->save() (line 815 of 

Since aliases can always be regenerated (if you are using the Pathauto module), you can safely delete them. So, to fix the error truncate both path alias tables:

$tables = [

foreach ($tables as $table) {

then proceed to the Bulk generate page (admin/config/search/path/update_bulk) and generate path aliases again.

Before doing this make sure that you don't have any manually entered ('Generate automatic URL alias' unchecked) path aliases.


Warning: If you have manually entered path aliases then don't use this method to fix the error, because you will lose content that can't be regenerated automatically.

About the Author

Goran Nikolovski is an experienced web and AI developer skilled in Drupal, React, and React Native. He founded this website and enjoys sharing his knowledge.