Ticket #47313: wp_insert_term_catch_taxonomy_insert_error.diff

src/wp-includes/taxonomy.php

@@ -2276 +2276 @@
                         'term_taxonomy_id' => $tt_id,
                 );
         }
-        $wpdb->insert( $wpdb->term_taxonomy, compact( 'term_id', 'taxonomy', 'description', 'parent' ) + array( 'count' => 0 ) );
+
+        if ( false === $wpdb->insert( $wpdb->term_taxonomy, compact( 'term_id', 'taxonomy', 'description', 'parent' ) + array( 'count' => 0 ) ) ) {
+                return new WP_Error( 'db_insert_error', __( 'Could not insert term taxonomy into the database.' ), $wpdb->last_error );
+        }
+
         $tt_id = (int) $wpdb->insert_id;
 
         /*