Ticket #23085: 23085.2.diff

wp-includes/wp-db.php

@@ -1199 +1199 @@
                         $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
 
                 // If there is an error then take note of it..
-                if ( $this->last_error = mysql_error( $this->dbh ) ) {
+                if ( is_resource( $this->dbh ) && $this->last_error = mysql_error( $this->dbh ) ) {
                         $this->print_error();
                         return false;
                 }