diff -u b/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php b/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
--- b/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
+++ b/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
@@ -10,8 +10,7 @@
 // cSpell:ignore attrelid atttypid atttypmod bigserial conkey conname conrelid
 // cSpell:ignore contype fillfactor indexname indexrelid indisprimary indkey
 // cSpell:ignore indrelid nextval nspname regclass relkind relname relnamespace
-// cSpell:ignore schemaname setval
-// cSpell:ignore refobjid refobjsubid objid classid
+// cSpell:ignore schemaname setval refobjid refobjsubid objid classid
 
 /**
  * @addtogroup schemaapi
@@ -1110,10 +1109,10 @@
    */
   public function getSequenceName(string $table, string $column): ?string {
     $args = [
-      ':table' => $this->prefixTables('{' . $table . '}'),
+      ':table' => $this->connection->prefixTables('{' . $table . '}'),
       ':column' => $column,
     ];
-    return $this
+    return $this->connection
       ->query("SELECT pg_get_serial_sequence(:table, :column)", $args)
       ->fetchField();
   }
@@ -1131,7 +1130,7 @@
    */
   public function sequenceExists(string $name): bool {
     $args = [':name' => $name];
-    return (bool) $this
+    return (bool) $this->connection
       ->query("SELECT c.relname FROM pg_class as c WHERE c.relkind = 'S' AND c.relname = :name", $args)
       ->fetchField();
   }