Ticket #28430: plugin.php.patch

src/wp-includes/plugin.php

@@ -618 +618 @@
  */
 function plugin_basename( $file ) {
         global $wp_plugin_paths;
-
+        if ( ! isset( $file ) ) {
+                        return;
+        }
         foreach ( $wp_plugin_paths as $dir => $realdir ) {
                 if ( strpos( $file, $realdir ) === 0 ) {
                         $file = $dir . substr( $file, strlen( $realdir ) );