Ticket #25992: 25992.1.diff

Gruntfile.js

@@ -4 +4 @@
                 SOURCE_DIR = 'src/',
                 BUILD_DIR = 'build/';
 
-        // Load tasks. 
+        // Load tasks.
         require('matchdep').filterDev('grunt-*').forEach( grunt.loadNpmTasks );
 
         // Project configuration.
@@ -215 +215 @@
                                         filepath = filepath.replace( /\\/g, '/' );
 
                                         // Match only the filename passed from cli
-                                        if ( filepath.lastIndexOf( '/' + file ) === filepath.length - ( file.length + 1 ) ) {
+                                        if ( -1 !== filepath.indexOf( '/' + file ) && filepath.lastIndexOf( '/' + file ) === filepath.length - ( file.length + 1 ) ) {
                                                 return true;
                                         }