Ticket #16953: 16953.10.diff

src/wp-includes/plugin.php

@@ -617 +617 @@
 function plugin_basename( $file ) {
         global $wp_plugin_paths;
 
-        foreach ( $wp_plugin_paths as $dir => $realdir ) {
-                if ( strpos( $file, $realdir ) === 0 ) {
-                        $file = $dir . substr( $file, strlen( $realdir ) );
+        if ( is_array( $wp_plugin_paths ) ) {
+                foreach ( $wp_plugin_paths as $dir => $realdir ) {
+                        if ( strpos( $file, $realdir ) === 0 ) {
+                                $file = $dir . substr( $file, strlen( $realdir ) );
+                        }
                 }
         }