Ticket #64080: class-wp-upgrader.php.diff

wp-admin/includes/class-wp-upgrader.php

@@ -1061 +1061 @@
                 // Try to lock.
                 $lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'off') /* LOCK */", $lock_option, time() ) );
 
-                if ( ! $lock_result ) {
+                if ( 0 === $lock_result || false === $lock_result ) {
                         $lock_result = get_option( $lock_option );
 
                         // If a lock couldn't be created, and there isn't a lock, bail.